A common (well, twice, at least. I will become common if nothing is done) occurrence on new questions is the following:
@blue removes some tags
I ask why those tags are removed and @blue puts some (not always all) of them back.
I have also seen a lot of retagging edits by @blue. It seems that this user is under the impression that it is best if someone 'curates' the tags to keep things tidy.
I don't think this is a productive usage of time. First of all, 'mistakes' get made, which some user (e.g. me) can point out and we get a lot of edits. Second, questions get bumped to the front page without any good reason. Finally, the tag system was never meant to be a strict library catalogue. I think it works fine if we just leave it and only solve problems when they actually occur?
However, this is just my opinion. I'd like to hear what the community has to say about this, as I think that at least being clear on this would prevent a lot of unnecessary back and forth in the future.
Perhaps I should point to the famous comment by Robert Cartaino. Do note that this one can apply both ways, but at least I am talking about something that is actually happening.