Isn't taking Adderall to study longer another way to employ your brain differently?
In the same way that beating something with a wrench and beating it *faster* with a wrench is different, yes.
Do you dispute that a highly motivated intelligent student would perform better with more time to study?
No. I dispute that an un-motivated, idiotic student with more time to study would perform similar to a highly-motivated, intelligent student. I suggest that an un-motivated, idiotic student would perform similar to a highly-motivated, intelligent student if the former learned to use motivational techniques (e.g. examine the material to study, briefly analyze it from an engineering standpoint, and incorporate it into something of high interest to you) and mental techniques (e.g. SQ3R studying, deliberate practice, mnemonics) similar to those employed by the latter or such as to make them regard the material in a similar way to the latter.
Imagine a future where finishing college in 4 years is a red flag that you don't work hard enough. Where all the high achievers finish in three years with an internship every year and studying abroad and some kind of volunteer project on the side while being in 5 different on-campus organizations and leading at least one of them. And then when that's all over, the same people are expected to work 100-hour weeks all the time.
Besides solving poverty, I am working on the more difficult task of creating an education system which equips small children up-front with the mental tools and techniques to function as geniuses. This has produced some interesting reflections about the nature of education and poverty--that you need tailored strategies for the local culture to make the education system actually work, and so must have a different approach to the same education in poor, inner-city ghettos--among other things. What, then, would you say about a world where not having the education which turns any arbitrary human into a genius is a disadvantage? Is it much different?
I will tell you that I am strongly tolerant of psychosis. I have been afflicted with drug-induced psychosis and with psychologically-induced psychosis. I spent a decade on methylphenedate, eventually paired with risperdal, which induced weak drug psychosis; from this, much of my life has been spent as a collection of many points of view, in which I am a single person existing dozens or hundreds of times, and can move between these viewpoints at will so as to avoid stress. I also learned to stand up separate personalities (under my control, but also semi-autonomous), and so was able to supply myself with constant psychiatric counseling using an array of internal counselors. I was later exposed to prednizone--this was a mistake, and caused severe mood swings, suicidal ideation, homicidal ideation, and so forth; I of course recognized and controlled these mental disturbances, with no outwardly-visible detriment.
Along with the drug-induced psychosis, I've triggered arguably-worse psychotic episodes from psychological burn-out, learning too many things at once, too fast. The results are similar. There is also the strange loss of touch with reality from this: hyper-immersion in work and study tends to make everything around you look like that work, for example making physical automobile traffic seem like something you could improve with the skillful use of firewalls...somehow.... This is a well-known psychiatric condition caused in normal human beings exposed to excessive job stress; it's actually common for college students to suffer dramatic neurotic breakdown in their late third or early fourth year.
Given that simply using your brain too hard can easily cause serious psychiatric pathology, what opinion do you have of simply improving the general education system?