Well, I disagree that the tag calls for a discussion. "Best practice" does not mean "What I like to do" it means "The official, recommended way" to do something. Maybe my definition is not held by everyone, however.
Often a question has a number of possible solutions, some being a bit more "hack-ish" than others. If asking for a best pratice, to me that means you are asking for the officially sanctioned, Marc Benioff blessed way of doing something - which actually should have a very specific answer (if it has one at all).
Now, whether we need a tag for that or not is a different topic. From that angle it's not really a big deal to me one way or the other. It would probably be more appropriate to be able to tag an answer as "best practice" (using my definition) than the question - because the "best practice" answer may or may not be the best solution to the problem.