> Apparently the physiological effects of prescription ADHD meds will tend to still be ~same intensity for years and years.

I'm not sure how one would even measure this. Like, back in the halcyon days of my youth I took a bunch of stimulants, and experentially there was definitely less impact over time (habituation is a thing).

And given that ADHD is predominantly a psychological issue, then the only measure that matters is that of the patients themselves.

Do you have some of the sources you mentioned available, I'd be interested to understand the details?