Previous community tags? Yes we still have those. Do you mean that a post might be ignored based on invisible (previous) community tags, or something else. Posts have their tags associated with them, and vice versa.
So imagine something like this: 1) Someone tags this with #reddit. flagamuffin is ignoring #reddit. 2) Someone else changes that tag to #redditsucks. 3) It pops up in flagamuffin's feed again. 4) flagamuffin changes it back to #reddit. 5) someone else changes it to #redditrules. 6) flagamuffin changes it back to #reddit and gripes. Now - if you're tracking all tags, this thing has been tagged #reddit, #redditsucks and #redditrules. If you're tracking all that, flagamuffin should have it ignored the first time it pops up #reddit, despite the fact that someone changed it back. No?
I wonder if it would confuse people even more, -the tag being either in their feed or ignored for an non-obvious reason. Also, flag can just change the community tag once. Everyone gets just one suggestion. So he gripes at #3. We track the tags so it defaults to the most suggested. One possibility is that the behavior is either the current tag, or the one you suggested, if you did suggest one. That might be even more confusing.