I'm thinking of this example in particular, but have seen it happening before: [How to improve critical thinking?](https://philosophy.stackexchange.com/q/26825/2953)

First version by the OP:

> 
> What are the proven methods that boost critical thinking in a person
> 
> 
> 

The post was closed as too broad for obvious reasons.

Second version, as edited by one of our users:

> 
> Kant's fundamental work **Critique of Pure Reason** votes for critical thinking already by its title.
> 
> 
> What are methods that boost critical thinking in the sense of Kant's book?
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> 
> 

There were also tag changes. This question was reopened.

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The first version did not mention Kant whatsoever, nor was it mentioned in the comments. The edit introduced this, as well as the tags 'kant' and 'critique-of-pure-reason'.

If I would have reviewed that edit, I would have rejected it as not reflecting the intentions of the author. On the other hand, one could argue that as the post is closed anyway, we can try to change it so that it can be reopened.

### In what cases would it be OK to change the meaning of a post substantially?

I'm thinking in terms of:

* Whether the OP is active/inactive
* Time since last activity
* Number of answers
* Whether the question is closed or not
* Vote count
* ...?

### Or is this never OK? Should we open a new question for substantially different questions / only allow the OP to make such edits?

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Note: at the moment of writing there is a suggested edit on the post I gave as an example, I don't intend to look at this post specifically so it is not relevant.

Note: I was very close to rolling back the edit on the example post for the reasons stated above and only didn't because it had been reopened afterwards.

Note: the user making the first edit has 0 suggested edits rejected, and several accepted. I have looked through these reviews and of some [like this one](https://philosophy.stackexchange.com/review/suggested-edits/13092) it seems unthinkable for me to accept such an edit. I don't mean to say some users aren't thinking when reviewing, nor do I want to discuss this particular user (I'm sure he's acting in good faith), but **it does indicate it may be time for a discussion what kind of edits are OK**. I realise it's a gray area; I too voted to [keep editing subjective questions](https://philosophy.meta.stackexchange.com/a/2856/2953), for examples.