I am seeing an obsolete comment often; namely some variation of "do not answer in comments.".
Please stop leaving these pointless comments behind when you remove comments.
To clarify, @mxyzplk, I'm not trying to be a smart-alek here, it's a serious comment. To me, those "Please do not use comments for answers" had no purpose; they seemed to be a waste of screen real estate telling me something that (hopefully) I already know.
Thanks for explaining why you are leaving those comments. I hadn't thought about someone who sees their comment gone thinking "oh, the system ate my comment" and reposting it.