user62: A  question I just stumbled upon, Why is the ending of Death Note in the anime so different from the manga?, is an example of the generic question type: "Why did they change X?" or "Why did they write it that way?". The only person that can answer these questions are the writers, resulting in any such question being unanswerable if there isn't an answer posted somewhere on the internet. As is outlined in the FAQ of every Stack Exchange site, You should only ask practical, answerable questions based on actual problems that you face. Since the vast majority of these questions won't be answerable, they should all be closed. After all, any answer not based on an official statement from the author would be 100% speculation. 
I'm sure someone will raise the objection that since some of these questions have answers somewhere on the internet that those ones should be opened. However, since there is no way of knowing if such an answer exists until someone posts it, then that means we can't know if an answer is answerable when the question is posted. If we can't know a question is answerable, then it's unanswerable.
For the sake of argument, let's assume we did allow these questions when an answer from the author exists. Since we still can't know if the question is answerable when it's posted, it means we would either need to:

Assume an answer exists until the question goes unanswered for a certain amount of time.
Assume an answer doesn't exist until someone finds it.

Neither of these situations is acceptable. Assuming an answer exists for a set amount of time will result is likely to  have the question be forgotten about, and never closed (clogging up the site with questions which should have been closed and deleted). In addition, any time we chose would be completely arbitrary. Do we wait an hour? A day? A week? If we need to start making arbitrary rules up to allow a question that's a clear indication the question should not be allowed.
Assuming an answer doesn't exist means we'd need to close the question, and then leave it on the site in a closed state indefinitely, until someone posts a comment saying they found an answer. Frankly, this is a completely ridiculous course of action to take. Having a bunch of closed questions floating around is just as bad as having a bunch of opened questions which should be closed. 
Furthermore, closing is meant to be a temporary state, where all questions will either be deleted or re-opened (in the latter because the author fixed them). Closing isn't intended to be used on a question we never have any intention of re-opening unless a specific event eventually happens. After all, if we're just going to keep the question around forever, what's the point of even closing it in the first place? 
In conclusion, "Why did they write it that way?" questions should be deemed off-topic since they are not answerable. 

user27: Yes, they should be either off-topic or not-constructive, that's mostly based on the wording of the question.
The answer is unanswerable by any means. It's very rare that this sort of information is voluntarily released by the mangaka or the production team.
So I believe we should generally and inclusively disallow them. Of course, there would be cases where the answer is answerable. But the line must be drawn.

user98: What you've cited is a question that is perfectly, but difficulty, answerable: if an interview or a document with/by the author of the manga or the director of the anime is available.
Here an example about Mohiro Kitoh's Bokurano:

In closing, I have to post what I don't want to post: the director of the animated version of Bokurano dislikes the original manga.

Q: Why Bokurano anime end differently from the manga?
A: Because the director of the anime dislikes the manga (quote)
The answerers have to search sources by original authors before starting speculations, looking for evidences about the creation process of that precise work. 
Actually, answering this question correctly requires a high level of expertise and a deep knowledge of the work by a author, so with some fix it's a very attractive question for SE.

user24: I mostly agree, but it's a bit of a slippery slope to say that all questions should be off-topic unless they definitely have an answer. If we want to restrict ourselves only to those questions which are definitely answerable without speculation, we'd miss a lot of potentially good questions. For instance, many questions about a potential plot hole falls into this category. Consider this question, and imagine if Oda-sensei had never thought about it, and there was no good reason why the Straw hats couldn't just go the other way. Then this would be an unanswerable question by your definition, but still not a bad one I'd argue.
Quoting from Shog9's answer on Should we explicitly allow discussions?,

Questions where the answer is obscure or difficult to obtain (relies on knowledge in an author's private journal, protected by a non-disclosure agreement, guarded by a dragon). These can be ok, if folks are disciplined about not answering when they don't have access to information. If they degenerate into idle speculation, they should be shut down as with #1.

I do think that these questions are usually not great questions, but they are not always off-topic IMO. What we should definitely not do is allow speculation in the answers. If an answer seems to be entirely speculative, then you should downvote it and leave a comment.
We do need to draw the line somewhere, or else we're inviting a potentially unlimited number of questions like this. "Why did they write it this way?" will almost always be unanswerable, so I think it's a reasonable place to draw the line, but we may need to come back in the future to rethink this.

62: <p>A  question I just stumbled upon, <a href="https://anime.stackexchange.com/questions/356/why-are-there-ending-of-the-series-death-note-so-different-in-manga-and-anime">Why is the ending of Death Note in the anime so different from the manga?</a>, is an example of the generic question type: "Why did they change X?" or "Why did they write it that way?". The only person that can answer these questions are the writers, resulting in any such question being <em>unanswerable</em> if there isn't an answer posted somewhere on the internet. As is outlined in the FAQ of every Stack Exchange site, <code>You should only ask practical, answerable questions based on actual problems that you face</code>. Since the vast majority of these questions won't be answerable, they should all be closed. After all, any answer not based on an official statement from the author would be 100% speculation. </p>

<p>I'm sure someone will raise the objection that since <em>some</em> of these questions have answers somewhere on the internet that those ones should be opened. However, since there is no way of knowing if such an answer exists until someone posts it, then that means we can't know if an answer is answerable when the question is posted. If we can't know a question is answerable, then it's unanswerable.</p>

<p>For the sake of argument, let's assume we <em>did</em> allow these questions when an answer from the author exists. Since we still can't know if the question is answerable when it's posted, it means we would either need to:</p>

<ul>
<li>Assume an answer exists until the question goes unanswered for a certain amount of time.</li>
<li>Assume an answer doesn't exist until someone finds it.</li>
</ul>

<p>Neither of these situations is acceptable. Assuming an answer exists for a set amount of time will result is likely to  have the question be forgotten about, and never closed (clogging up the site with questions which should have been closed and deleted). In addition, any time we chose would be completely arbitrary. Do we wait an hour? A day? A week? If we need to start making arbitrary rules up to allow a question that's a clear indication the question should not be allowed.</p>

<p>Assuming an answer doesn't exist means we'd need to close the question, and then leave it on the site in a closed state <em>indefinitely</em>, until someone posts a comment saying they found an answer. Frankly, this is a completely ridiculous course of action to take. Having a bunch of closed questions floating around is just as bad as having a bunch of opened questions which should be closed. </p>

<p>Furthermore, closing is meant to be a <em>temporary</em> state, where all questions will either be deleted or re-opened (in the latter because the author fixed them). Closing isn't intended to be used on a question we never have any intention of re-opening unless a specific event eventually happens. After all, if we're just going to keep the question around <em>forever</em>, what's the point of even closing it in the first place? </p>

<p>In conclusion, "Why did they write it that way?" questions should be deemed off-topic since they are not answerable. </p>
 27: <p>Yes, they should be either off-topic or not-constructive, that's mostly based on the wording of the question.</p>

<p>The answer is unanswerable by any means. It's very rare that this sort of information is voluntarily released by the mangaka or the production team.</p>

<p>So I believe we should generally and inclusively disallow them. Of course, there would be cases where the answer <em>is</em> answerable. But the line must be drawn.</p>
 98: <p>What you've cited is a question that is perfectly, but difficulty, answerable: if an interview or a document with/by the author of the manga or the director of the anime is available.</p>

<p>Here an <a href="http://www.animenewsnetwork.com/news/2007-06-14/bokurano-helmer-changes-story-due-to-dislike-of-manga" rel="nofollow">example about Mohiro Kitoh's Bokurano</a>:</p>

<blockquote>
  <p>In closing, I have to post what I don't want to post: the director of the animated version of Bokurano dislikes the original manga.</p>
</blockquote>

<p>Q: Why Bokurano anime end differently from the manga?
A: Because the director of the anime dislikes the manga (quote)</p>

<p>The answerers have to search sources by original authors before starting speculations, looking for evidences about the creation process of that precise work. </p>

<p>Actually, answering this question correctly requires a high level of expertise and a deep knowledge of the work by a author, so with some fix it's a very attractive question for SE.</p>
 24: <p>I mostly agree, but it's a bit of a slippery slope to say that all questions should be off-topic unless they definitely have an answer. If we want to restrict ourselves only to those questions which are definitely answerable without speculation, we'd miss a lot of potentially good questions. For instance, many questions about a potential plot hole falls into this category. Consider <a href="https://anime.stackexchange.com/questions/1/the-one-piece-treasure-is-at-the-end-of-the-grand-line-but-isnt-that-the-s">this question</a>, and imagine if Oda-sensei had never thought about it, and there was no good reason why the Straw hats couldn't just go the other way. Then this would be an unanswerable question by your definition, but still not a bad one I'd argue.</p>

<p>Quoting from Shog9's answer on <a href="https://anime.meta.stackexchange.com/questions/145/should-we-explicitly-allow-discussions">Should we explicitly allow discussions?</a>,</p>

<blockquote>
  <p><strong>Questions where the answer is obscure or difficult to obtain</strong> (relies on knowledge in an author's private journal, protected by a non-disclosure agreement, guarded by a dragon). These can be ok, if folks are disciplined about not answering when they don't have access to information. If they degenerate into idle speculation, they should be shut down as with #1.</p>
</blockquote>

<p>I do think that these questions are usually not great questions, but they are not always off-topic IMO. What we should definitely not do is allow speculation in the answers. If an answer seems to be entirely speculative, then you should downvote it and leave a comment.</p>

<p>We do need to draw the line somewhere, or else we're inviting a potentially unlimited number of questions like this. "Why did they write it this way?" will almost always be unanswerable, so I think it's a reasonable place to draw the line, but we may need to come back in the future to rethink this.</p>
