user254: Based on the input from a discussion with several users on meta, we defined this Moderation policy for Questions.
It's a very liberal policy: i.e. almost all questions are permitted.
Is that policy working well, now? Would you like to revise it? Can you identify further types (or subtypes) of question which ought to be closed?
Identifying in general some types of question to be closed is a bit difficult, but it is useful:

It helps moderators and users to understand which questions ought to be closed
It helps us understand why they ought to be closed
It helps us understand how to edit them so that they can be reopened (or whether they can't be salvaged by an edit)

One recent example is that closed this question, and I appended "Broad comparisons" as a new close reason (at the bottom of the moderation policy for questions), only because Andrei had previously identified for me (in this post) something wrong with this kind of question and how to identify that.
In case it helps to be specific, for the sake of discussion, are there questions you would identify which weren't closed under the current policy, but where it would have been better if they had been closed?

user143: There are 5 reasons listed under the vote to close option: duplicate, off topic, unclear, too broad, primarily opinion based. 
During a period of time when we were receiving few questions, and trying to meet the criteria listed in Area 51 for graduation to a full site, we discussed and implemented a policy of allowing virtually any question outside of a few special exceptions such as an exact duplicate or a hostile question. Our "problem" at the time was we didn't have enough questions coming in to meet SE criteria and this was an attempt to solve that problem.
Live and learn. We now are struggling, at times, with questions which are off topic, unclear, too broad, and primarily opinion based. The primarily opinion based questions are in a special category of problematic because they can open the door to endless opining back and forth without any objective criteria for selecting a best answer. And not having this back and forth "forum style" interaction is what makes this site special and different than other forums for some users. We seem to appreciate the neatness of simply providing an answer and leaving it at that as compared to being drawn into arguments via endless comments. 
Going back to closing questions which the community votes as duplicate, off topic, unclear, too broad, and primarily opinion based seems to be a reasonable response to our newer "problem" that the site is seen (by a number of members of the community) as taking a turn for the worse by going down the road of argumentative forums.

254: <p>Based on the input from a discussion with several users on meta, we defined this <a href="https://buddhism.meta.stackexchange.com/a/1572/254">Moderation policy for Questions</a>.</p>

<p>It's a very liberal policy: i.e. almost all questions are permitted.</p>

<p>Is that policy working well, now? Would you like to revise it? Can you identify further types (or subtypes) of question which ought to be closed?</p>

<p>Identifying <em>in general</em> some types of question to be closed is a bit difficult, but it is useful:</p>

<ul>
<li>It helps moderators and users to understand <em>which</em> questions ought to be closed</li>
<li>It helps us understand <em>why</em> they ought to be closed</li>
<li>It helps us understand <em>how</em> to edit them so that they can be reopened (or whether they can't be salvaged by an edit)</li>
</ul>

<p>One recent example is that closed <a href="https://buddhism.stackexchange.com/q/11437/254">this question</a>, and I appended "Broad comparisons" as a new close reason (at the bottom of the moderation policy for questions), only because Andrei had previously identified for me (<a href="https://buddhism.meta.stackexchange.com/a/394/254">in this post</a>) something wrong with this kind of question and how to identify that.</p>

<p>In case it helps to be specific, for the sake of discussion, are there questions you would identify which weren't closed under the current policy, but where it would have been better if they had been closed?</p>
 143: <p>There are 5 reasons listed under the vote to close option: duplicate, off topic, unclear, too broad, primarily opinion based. </p>

<p>During a period of time when we were receiving few questions, and trying to meet the criteria listed in Area 51 for graduation to a full site, we discussed and implemented a policy of allowing virtually any question outside of a few special exceptions such as an exact duplicate or a hostile question. Our "problem" at the time was we didn't have enough questions coming in to meet SE criteria and this was an attempt to solve that problem.</p>

<p>Live and learn. We now are struggling, at times, with questions which are off topic, unclear, too broad, and primarily opinion based. The primarily opinion based questions are in a special category of problematic because they can open the door to endless opining back and forth without any objective criteria for selecting a best answer. And not having this back and forth "forum style" interaction is what makes this site special and different than other forums for some users. We seem to appreciate the neatness of simply providing an answer and leaving it at that as compared to being drawn into arguments via endless comments. </p>

<p>Going back to <strong>closing questions which the community votes</strong> as duplicate, off topic, unclear, too broad, and primarily opinion based seems to be a reasonable response to our newer "problem" that the site is seen (by a number of members of the community) as taking a turn for the worse by going down the road of argumentative forums.</p>
