If we are gonna debate 'unmentioned assumptions', there are several in the idea that psychology is NOT a subset....which is why I think there are 'unanswerable questions'....and why I only 'doubt', and not deny.

Science, if done properly, does not explicitly make 'assumptions' of that nature. It is just that it has no other way of proceeding. Those who make claims, assertions and offer theories as to other bases for psychology are free to do so....but all they can do is vote to agree among themselves..... much as Christians do about the Trinity and resurrection.

As my daddy used to say, "It's the same, only different"