But this doesn't really answer the question. How would you define "physicalism" such that the entirety of reality would not be subject to being understood by physics? — Metaphysician Undercover
First let me clarify what I was disagreeing with:
One, I was disagreeing with the idea of supporters
defining physicalism as "that which is studied by physics." That makes physicalism basically a "parasite" on the discipline of physics per se. I think it's ridiculous to
define physicalism that way. To physicalist ontologists the discipline of physics is NOT king and it doesn't get to define what counts as "physical."
Rejecting that definition doesn't imply that the subject matter of the discipline of physics
couldn't be coextensive with what physicalism posits ontologically, but in practice, the subject matter of physics is NOT coextensive with physicalism. Chemistry, for example, is a separate scientific discipline from physics. But what chemistry studies is also covered by physicalism's ontology. Likewise with geology, astronomy, meteorology, oceanography, archaeology, anthropology, sociology, psychology, computer science, philosophy, music, visual art, etc. None are what is studied by physics, but they're all part of a physicalist ontology.
Could physics study everything more or less in the manner of those other disciplines? Sure, if there were a major paradigm change in the academic world regarding how to divide up fields, so that everything was simply considered physics. But that's extremely unlikely. Especially because it would be kind of stupid to do that, because you're not going to major in physics and spend years just studying sociology. But you need to study just sociology for years to get degrees in it/to be an expert in it. So there would still be a need to make a division, and there would be no utility to all of a sudden deciding to say, "Okay, well, we're going to say that all this is under the field of physics anyway."
Another reason that physicalism is not
defined by what is studied by physics is that it wouldn't be impossible for physics to posit immaterial phenomena somehow, including positing real abstracts. Physicists have already posited a huge amount of nonsense, and arguably a majority of physicists buy real abstracts, because probably most are mathematical realists/platonists. Since physicalism isn't simply the cheerleading team for physics, we're not endorsing that sort of nonsense, which isn't part of physicalism's ontology.
So it's not at all the case that physicalism is defined by what is studied by physics.
Two, I was disagreeing with the comments about explanations/descriptions. I've gone into this in some detail in a few posts on different threads recently, including back and forth with you (in other threads).
Explanations are merely sets of words (or mathematical symbols, etc.) that an individual interprets so that it quells some of their "mystery to me" feeling. This, of couse, means that it's a matter of psychological factors. It means that what counts as an explanation for something is a subjective issue. The individual's beliefs, biases, intellectual capabilities, and so on, all have a significant bearing on whether any particular set of words scratches that "it's a mystery" itch for them. That makes whether something counts as an explanation interesting primarily for what it tells us about the person in question's psychology.
What's
not going on is that the set of words is "really" explaining or not explaining whatever it's about. Whether an explanation is successful is
always a subjective judgment.
So for some people, maybe right now, physics can already explain everything. For some people, maybe physics can explain
nothing. And then you get every opinion in between those two. Neither opinion can be correct/incorrect. It's just a matter of whether something psychologically satisfies your "mystery to me" feeling for whatever it is.
When I say that everything, including consciousness, is physical, my aim isn't to get you to think that something is explained. Depending on the person, I often couldn't care less whether they (say they) feel that anything is explained. That's a matter of struggling with someone's psychology, and it's often not worth doing that, depending on their biases, their stubbornness, the degree to which they can seem to be willfully "difficult," their knowledge and intelligence, etc.