It seems to me like the biggest problem, if I'm to accept that Adderall is as frequently abused as described here, is the same one you have in sports with PEDs: if a bunch of people are on Adderall and establish the "baseline" level of attention you're supposed to have, then "just" being diligent gets you left in the dust.
I don't find the sports analogy very compelling. We watch sports for the competition and the idea that the results are a combination of genetics+work. Hence taking PEDs is cheating in a sports context.
But if there's a medication that helps you live your life better (i.e. in a way that's more fulfilling to you) and if taking the medication doesn't impact anyone else negatively, why would you not want it taken as widely as possible?
The important thing is to let would-be medication-takers know with full honesty what the side-effects are - this is what the article focuses on most.