(Mild ADHD here) Hyperfocus sounds great, yet it comes at a steep price: extreme exhaustion. Sometimes I just can't work for days (weeks happen) straight. Then at times hyperfocus kicks in and I complete three days work in one swoop, but after that I feel energetically empty. You're right on the dependence because HF gives a high, and I admit although the attention deficit part is a terrible pain, the high is so great that a part of me doesn't want to medicate, because it would go away.