Earlier quoted context omitted.
Further, asking adhd folk to "pay careful attention" is like asking a paraplegic to mind where he steps. Just FYI.
You're not wrong—but its not impossible—and it really helps! Having followed a lot of that advice in the past, and currently being in a slump; I can say it really it matters. Medication increases your chances of following through and the rewards compound.
No but it actually is though. The entire thing with ADHD is that the whole attention mechanism is defective.
Yes I can purposefully focus on something, but not consistently or over longer periods. That's the handicap. It's not a matter of not trying hard enough or figuring out one crazy trick. People with ADHD work differently from normal people and so far there's no fix for it.