I see no reason why it isn't allowed to in-line edit questions/answers for users below 2k. Is there some special reason?
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I think the basic jist is that it's just a beta feature & they want to prevent the majority of users from having a tarnished experience -- forgive me if I misunderstand, I just figured that was @waffle's intent given the large number of changes.
Further, I guess it also makes sense that these are the users most likely to use the feature anyway.