Earlier quoted context omitted.
Is it abuse if you use them for performance reasons and moderate it properly? Just because the distributors of the drug say it is abuse doesn't mean it is - they do not get to decide these things.
this is to my point. who then is the arbiter of abuse? OP? x pills is fine, y pills is fine, z pills makes you a "complete moron".
However I think you're over simplifying the question. Not everyone has the same response to drugs/substances. Some people can do what systematical does without any long term side effects because they simply have the willpower, self awareness, and personality type that allows them to avoid becoming dependent.
Conversely other people would become dependent and turn into complete wrecks almost over night. Similar things can be said for alcohol, or any other "altered stated". It doesn't necessarily mean that the substance itself is the problem, or that all use is "abuse".
It really comes down to knowing yourself, knowing your own limits, and being as well informed as you can be.