I notice that many of my questions on Worldbuilding meta are along these lines, but hey, everyone else seems to have already asked the good questions.
Okay. To the point at hand. I've seen the sci-fi tag used recently, and I'm wondering what it adds to questions. It doesn't have a tag summary (which is part of what makes me reach for the ax), and the questions it uses (mostly) don't seem to be solidly based in sci-fi - at least, not to the extent that science fiction is the primary concern of the question.
Possible arguments against this:
That is, if these ideas go through the gauntlet of meta - which they very well may; I can't say yet.