Yeah, you can't really make a case for doctors being much more than 3rd party observers of stim use, often with limited knowledge, who can keep your use in check solely by limiting the amount doled out to you/make you scared because they'll cut off your supply if they find out you did something they told you not to.
It's actually dangerous to. Plenty of people end up in the trap of daily doses of amphetamine that are way too high to possibly be good for you short or long term following doctors blindly.
What proper stim use is, and what you should use them for, is so subjective in reality that they'll never figure it out, because that goes into "What should people/I do with their/my time on earth?" which is definitely one of the impossible/completely subjective questions that burn for us all.
The most we can ever even hope to figure out is how much of what is gonna fuck you up long-term and how in terms of complicated brain shit and said complicated brain shit's impact on you. POTENTIALLY, we can also figure out what brings brain activity closest to a level in line with average/some defined level at which these problems disappear with a high degree of reliability.
Medical science is simply not far enough for either of these things yet. The answers just aren't out there. That's scary and hard to accept compared to what many believe about psychoactive substances in general having these reliably reproducible effects like antibiotics treating infections. It's a different game with a whole different set of rules being approached from a perspective that is scarcely related at all when you examine the facts.
But people always have been, always are, and always will be this way about things they don't know about. It seems undeniable if you so much as examine pretty much fucking anything humans do that we have an extremely powerful instinct to make conclusions and feel things are settled without knowing nearly enough to do so. We even do it when we know and acknowledge at the same time that we're not sure.
It's just how us button-mashing chimpanzees work, and hard to admit/cope with precisely because of itself. What the fuck are we supposed to do knowing that about ourselves? All I can think of is keep being weird animals with disjointed perspectives and reasoning ability, try to have a good time doing it, and try not to make ourselves unhappy or hurt ourselves by thinking we know more than we do.