I feel like there is a fundamental problem with this discussion. There's a way to have informed discourse on the matter and a way to have uninformed discourse. Plain and simple, the fact that adderall provides a sharper level of focus is an advantage. Understanding what this advantage translates into and having a proper discussion on it is frequently where these types of threads fall apart.
Let's introduce a thought experiment, shall we? Say I flash-cloned a perfect copy of Sonic Fox. We could then run Sonic-Prime vs. Sonic-One match-ups that would theoretically be perfectly 5-5. Both players would literally have the same level of knowledge and proficiency. Now, say we allowed Sonic-One to use adderall to sharpen his focus for the matches. Given an incredibly high and equal starting level of understanding, execution and reaction, any sort of improvement in focus would most likely yield a significant change in how the matches play out. Adderall, as a drug provided to sharpen the mind's focus, would provide an increase in performance but it wouldn't be some sort of miracle drug. Someone who is attending a major for the first time couldn't pop two pills and suddenly make top eight. But likewise, the benefits of the drug would not be completely benign as it would shape and enhance performance relative to where it was in the first place.
Steroids have been mentioned already as an analog to adderall. I think most of you have been shooting down this comparison, but it's actually 100% accurate. Steroids aren't some miracle drug that guarantees an incredible increase in muscle mass in and of itself. The way steroids function is to provide a more efficient growth in muscles as they are exercised. Basically if an individual with no substantial muscle mass or training regimen were to ingest steroids, nothing would really happen just because of that action. And if the individual didn't subscribe to an already efficient method of muscle training, the steroids wouldn't guarantee some insane bulking up akin to body builders just because they were ingested. Steroids have the most substantial role at high levels of muscle training and competition. No amount of steroids are going to turn a high school baseball player into an MLB slugger without a substantial amount of work on the underlying ability and muscle foundation of that individual.
TLDR: There is no way to deny the advantage adderall provides over your normal functionality. It hones your focus just like steroids hone your muscles' natural growth. However, it isn't going to miraculously induce tournament wins in noobs. These types of supplements do affect outcomes at the highest levels, which is still an unfair and bought advantage.