>does this not put a pretty big nail into reductionist scientific worldviews

It's just generalized enough to be vaguely descriptive, not prescriptive, at least not yet. And I don't think it ever will because just as we have biologists, we still need medical professionals that can diagnose and understand more specifically the bottom layers.

Second question, someone mentioned Into The Cool, a book I'd like to also read that seems to take on this question.

Third question... to evoke the previous answer, why not both?