Oh I doubt I’d be surprised, but that’s more a problem of the people coming out of Philosophy 101 than the discipline itself. Frege and Bertrand Russell put most of the metaphysical extravagances to bed (in the Anglo-American tradition at least) with the turn towards formal logic and language, and the modern-day analytic tradition hasn’t ever looked back.
As it stands the field has about as much to do with mind-body dualism or idealism (or their respective toolkits) as theoretical physics. This goes for ethics and meta-ethics, and no serious writer in that topic would entertain Cartesian dualism or Kantian deontology or any other such in a trivial form. The idea of contingent, historical, contextually-sensitive ethics is widely recognized and is indeed a topic of lively discussion.
You write this like it’s an original insight and not a problem that has been taken seriously by every philosopher who ever wrote seriously about ethics or meta-ethics.