Now if drugs in general were legalized this would be less of a problem as there wouldn't be pharmacies running out because of recreational or off-label use, but I will get off that soapbox for a second.

NT people who are using amphetamines or methylphenidate for performance enhancement are idiots. There is only one area where these things can actually improve NT performance, and that's in situations where you absolutely need to stay up at unusual hours. That's why militaries across the world have used them, and some countries continue to use them. Soldiers falling asleep during battle is apparently not ideal. Outside of that scenario though I have only seen evidence of it harming performance overall. Even in military use the USA military have switched to modafinil for a reason.

Adderall is an amphetamine derivative, so I can't imagine it's good to abuse that long term. Being prescribed it by a doctor does not count as abusing it though. The fact that people think it is abuse is part of the reason diseases like ADHD are so stigmatized.

As for the phenomenon of running out in the midterm and finals: it is entirely possible that some people with legit ADHD only need their medication during times when more is being demanded of them. I don't think it's fair to punish these people. There are also people with prescriptions selling the stuff though, which isn't great, but again could be resolved through legalization.