A lot of new users are confused about the tag 'ingredient-selection'. It would seem to apply to things like "Why were apples used in this recipe" or "Should I substitute peaches or pears in this recipe?", but it does not. Instead it to things like "How can I tell an apple is ripe?" Both types of questions have to do with selecting ingredients; is there something we can rename the tag to to make it more clear?
The tag wiki would seem to make it clear, and we went out of our way to create that new tag in order to quarantine the original (horrible and now-abolished) "ingredients" tag.
I am personally on record several times as saying that if users are consistently using the wrong tag, then it is probably a problem with the tag, not the users. So I'm usually on the lookout for this type of tag problem, and well-aware of the frustrating misuse of this particular tag. But I'm just not sure how much clearer we can make it without resorting to even worse tags like [shopping].
To select means to "carefully choose as being the best or most suitable". That doesn't connote (to me) questions about substitutions, or recipe modification, or about ingredients in general.
I think the existing tag is the best option among many lukewarm alternatives, but of course, I'm open to suggestions as well.