Here are two simple tag questions:
I think you're right, white isn't really useful. Almost all questions on the site involve White (and Black). It might make some sense to group all questions focusing on an opening repertoire for white, but we're not going to retag all those questions. So the best option (to me) seems to be to burninate it.
Looking at the patterns tag description, it's a subset of tactics, but a few questions (Why is it common to castle right after the opponent castles?, Looking for information on PARADISE (software)) are not. Formation makes me think of a pawn formation, but we already have pawn-stucture for that. Perhaps Is Colle-Zukertort a good way to improve beginner play? and What are the advantages of the Stonewall attack? can be retagged to use that one. If we then drop the formation tag from Full "reverse checkers" position in GM game with 12 or more pieces per player?, it'll be gone.