I think that tags on the main site are unreliable. If we used a chat room to discuss potential edits to tags, that discussion might be faster, because chat allows us to @ping people to get their attention.
Or maybe the problem is too big to address (would be 1000 questions on the main site to retag/revisit, compared to the only 120 questions that I retagged on the meta site).
But I read/retagged all meta posts in less than 3 hours, so doing something similar to the posts on the main site wouldn't be out of the question, e.g. for more than one person and/or more than one editing session.