Nevertheless, moral questions aren't (even potentially) empirical, since they're obviously seeking normative and not factual answers.

You can't go from an is to an ought. Nevertheless, some people go from the "well-being and suffering" idea to ideas like consequentialism and utilitarianism, and from there the only remaining questions are factual. Other people are prepared to see a factual basis for morality in neuroscience and game theory. These are regular topics of discussion on LW. So calling it "obvious" begs the whole question.