This does make sense given modern understandings of ADHD are that it's not about it being a deficit in attention but rather a deficit in self-regulation and executive functioning.
I focus, and hyperfocus, without any help from a stimulant.
In fact, I am far more likely to go deep into a rabbit hole, of useful or wasted time, when I am tired.
But with a stimulant it is far easier at any time to choose to focus on ordinary important tasks, follow through, and enjoy getting necessary things done. I.e. improved executive function.
