This is true and quite an interesting and nuanced point. But the connotation of this discussion, and something I expect applies to the overwhelming majority of

This is true and quite an interesting and nuanced point. But the connotation of this discussion, and something I expect applies to the overwhelming majority of people, is an association of physical manifestation (brain morphometrics or whatever) causes issue, rather than issue causes physical manifestation. In particular this whole thread of discussion started back with somebody expressing a bit of skepticism about the definitive nature of ADHD (and other psychiatric disorders) and somebody responded with the brain morphometrics as proof of such, yet in reality that's mostly still just begging the question.