Use case: sometimes I comment on a question. Then I decide to delete it. After let's say 2 minutes the user that posted the question answers my comment but my comment is long gone! His reply to my comment is out of context now because no one can see what that comment is referring to (my deleted comment).

If I chose to delete the comment it could be hidden but stay there allowing me to bring it back. This can be done with deleted answers right now where I can undelete it if I want.

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    Comments are second-rate citizens; just re-post the comment. – Martijn Pieters Jan 16 '14 at 14:24
  • @MartijnPieters If I repost it will be out of context too... – Leniel Maccaferri Jan 16 '14 at 14:24
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    While comments are second-rate citizens that doesn't mean they aren't citizens at all. I would judge this on its merits and only declined it under "second-rate citizens" if it proves to require too much developer time – Richard Tingle Jan 16 '14 at 14:25
  • Why did you delete the comment in the first place? – Mohammad Jan 16 '14 at 14:28
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    @user689 I have done that before: "Write something long and complicated", realise I was wrong, delete it, then realise actually I wasn't wrong and have to retype the damn thing out again – Richard Tingle Jan 16 '14 at 14:29
  • @user689 because I thought that what I had asked in the comment had already been answered in the question itself. Then I realized it had not been answered in the question... :) – Leniel Maccaferri Jan 16 '14 at 14:30
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    Its worth noting that comments are already only hidden, just very hidden (moderators can already retrieve them if they really want). So this wouldn't be that huge a change – Richard Tingle Jan 16 '14 at 14:47
  • perhaps the undelete feature should be time limited to prevent abuse. – John Dvorak Jan 16 '14 at 14:48
  • @RichardTingle yep... I thought about that too - I had a feeling this was how it's currently implemented. – Leniel Maccaferri Jan 16 '14 at 14:48
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    @Jan I'm not sure how someone could abuse such feature! – Mohammad Jan 16 '14 at 15:01
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    @user689 1:"I think we should do A -- suggester"; 2:"Wait no, better do B -- suugester"; [suggester swiftly deletes #2]; [someday later]3:"@suggester: That would be a bad idea, and the reason should be obvious. Too bad we can't downvote comments."; [suggester makes sure responder is gone, then undeletes #2] – John Dvorak Jan 16 '14 at 16:03