I agree with you on that. They all think it's a cute thing to do. (I can see it for certain warnings.) I've done it myself, but take my stupid tag away shortly, after a little thought.
I also am perplexed re old categories superseding newer more specific ones. Long ago we needed categories like Food, but now by the time food, and recipes, and fish show up, there's little room for interesting and useful specifics, some of which appear later in the thread than the first few posts and might interest others.