It hasn't been a major issue to me personally thus far, but I've noticed that a few tags from certain posts have been wrongly removed, and there's no way that I know of to check posts for removed tags without going through each one's tags manually.
Examples
I was wondering if there was a way to search for posts that have had certain tags removed from them, that way you can correct them (when applicable) without having to use "-example" to go through every post that doesn't have it. Since simply using "-example" may bring up far too many irrelevant results.
E.g.: Maybe you could search "remtag:male" to search for posts that once had the tag "male", but since have had it removed.
Updated by abadbird