To me, takes like these come from a classroom or historical understanding of philosophy as pie-in-the-sky theoretical musings, ignoring a lot of the actual contemporary (and even historical) work being done in the field.

Philosophy of biology is also it's own field, that deals with pressing foundational questions that biological work is based off of. I'm sure Hank could find plenty of topics that would pique his interest within the field. Bioethics is also very biologically and medically inclined.

Hank's point about biology is weird to me, because as someone who has learned Phil of Mind, neuroscience and biology are seen as paramount, and every theory of mind, whether its idealist, materialist, or even panpsychist, has to fit within the scientific understanding, otherwise it's ignored.

I don't think this discounts general systems theory as a whole though because the "Nazi justification" makes no sense, and he was by no means the only person who worked on it.