We discussed this before at Are "anime-physics" questions a good fit for our site?. There I answered that anime-physics isn't a very good tag in my opinion. This is a followup to that with the intent to either clarify or delete the tag.
anime-physics is, in my opinion, very vague. It seems to deal with almost any in-universe mechanics for any series, as well as certain tropes which exist in multiple universes (see e.g. this page). The tag wiki seems to me to imply it's for this latter category, in which case I think it's entirely covered by tropes, but a lot of the current questions in the tag don't fit that. I don't really know when I'm supposed to apply it. I don't understand why Why is Steins Gate in the Beta Attractor Field? isn't tagged with it, but Why do some anime characters never grow old? is.
To me it seems like a meta tag. I can't imagine anyone actually being an expert on anime physics, at least as broadly as it's being defined here. It has all the problems of character-abilities which we removed earlier for much the same reason.
Should we remove this tag? If it is going to stay, what objective criteria can be used to make the tag clear, useful, not a meta tag, and not a duplicate of tropes?