Don’t you think behaviourism was reductionist from the outset? That it was basically a Procrustean bed - because the mind couldn’t be observed, and science built around observation, then it has to be excluded from consideration. (Dennett does say somewhere that his approach is basically behaviourist.) — Wayfarer
I don't know enough about the history to say. I suspect not, I don't think most phycologists as psychologists, believe this. It's not even useful at all for what they do.
In philosophy, with the bit that I've seen (not a lot - I find it stupid and insulting), the feeling I get it that this approach (behaviorism, vulgar empiricism - meaning, modern versions - sophism, etc.) stands in contrast to another tradition, which you can call Platonic, Rationalistic, etc.
The main point of contention is that either the world is, put in corny manner: either there is something special about us, or there is not. Those who think that we are special, tend to be strong believers in the importance and range of mind. Those that do not, take us to be mere machines, doing what is to be expected from the "laws of nature", such that neither mind nor nature is special.
Dennett called himself a "Neo-positivist" in one paper, so, it's not too far off.
But I need to stress, not that you don't already know this: Locke and Hume whom I have read carefully, would be insulted by how empiricism has been so distorted and mangled. These were among the best philosophers in history, virtually nothing to do with this modern mediocrity.
As to how physics comes into consideration - isn’t it the case that modern mathematical physics is grounded in the quantisation of measurable attributes of bodies? And that this was then taken as paradigmatic for all manner of science, culminating in what René Guenon describes as ‘the reign of quantity’? Then only what is measurable is considered significant. And furthermore the paradigm assumes the separation of observer and observed - something which has been found to be untenable in quantum physics. — Wayfarer
Also very much in line with Tallis, whom you and I both admire.
I don't disagree this is what physics does, in essence. Nonetheless, I do believe that the stuff physics describes existed prior to us, and that we are made of the stuff of physics (but there's a lot more to it than physics, by an unimaginable amount), notwithstanding the many difficulties involved.
But I would agree with you, I think, in saying that, for all practical purposes, physics is not relevant to the mental, and it is related to the brain is a very basic and uninformative manner.