I think that many of these problems could be avoided if questions could be put in a sort of sandbox for improvements.
I already brainstormed a crude idea here.
That could be used also as a way to ask for “on-topic-ness” of a tentative question without the meta-mess we sometimes saw on SE meta (asking the question while asking if it was on-topic).
I think that the choice of using the “sandbox” should be left to the OP: if he is sure his answer is ok, then he direct-posts it, otherwise asks for a preventive “managed/reviewed/sandboxed” post.
Anyway a “direct-post” could be “sandboxed” by mods/high-rep users for the same reasons many SE questions were closed.
In this case, a motivated user could see the community interest in helping him, without perceiving the “closing” as a “door slammed in his face”.
When “sandboxed”, the posts should not be voted or answered, but just improved with live interaction with the community.
Of course this won’t be an alternative for instaclosing/instaburning spam or the like.