There are a couple ways of looking at this, yours is one take.

We can look at it another way. The kind of people with the intelligence and persistence to successfully complete a Ph.D. are disproportionately neurodivergent, IME. You’ll find a lot of people on the spectrum at the upper ranks of academia. Such people lack in dopamine production, and may end up taking medication to deal with that as they are diagnosed during the course of their graduate education, which typically provides access to healthcare and therapy.