No, OP(s) premise is also deeply flawed. I'm not an expert, but while there's similarities, these are profoundly different substances. Whereas alcohol only differs by concentration (maybe the release is slightly different, especially if it's eaten, instead of liquid), these stimulants are fundamentally very different.
On the other hand while Amphetamine can be compared to substances like meth or coke (it might actually be closer to cocaine as far as user experience goes), it's also has key differences. Cocaine is generally taken all at once, and the methyl family of amphetamine has specific, more drastic effects. Basically, meth's special, and shoots through barriers in the brain, that normally slow down other substances.
Amphetamine, on the other hand, has a more medium potential for abuse. Also, it's thought that people can generally keep up with therapeutic doses. In other words, while there may be some effect on the brain, you'll eventually reach a point where you're not constantly being drained of neurochemicals. This isn't possible with meth/coke, which is why they prescribe adderall fairly readily, but not meth.
I researched this recently after being prescribed adderall. I've heard that slow release cocaine is a better metaphor than meth, but I think there's probably issues with that too.
I think that's a fair evaluation, if not technically correct. But don't discount how different the effects can be: low-dose benadryl makes you sleepy. High dose benadryl makes you hallucinate people, spiders, and other things that aren't really there.