Meta-Ethics as First Philosophy

I want to say that philosophy can be divided into just ethics and meta-ethics, which would comprise everything else (semantics/hermeneutics, epistemology, logic, philosophical psychology, historiography, politics, aesthetics, what was traditionally called ontology, philosophy of science, and so on). Of course, this is nonstandard. The point is that all of these things have at least indirect meta-ethical relevance in one way or another, and meta-ethics can be regarded as what Aristotle would call first philosophy.

I also think that logic in particular has a directly normative character. Things like tautologies, logical rules, and modalities express strongly deontically binding higher-order norms relative to particular logics, not some strange kind of facts. This was apparently Frege’s view as well.