Could that be a learned adaption to ADHD rather than a directly caused trait? Or just hyper focus?
I do have a pet theory that many of us ADHDers develop habits to overcompensate but do so early enough that we don't realise they're learned. For example my room growing up was always super tidy, I literally never had to be asked to clean it and I'd know straight away if someone had been in while I was out. That really confused me when I got diagnosed but in hindsight it's because without everything having a consistent place I'd constantly lose things and never find anything.
It was definitely not an adaption - I was intrinsically motivated to keep going and read where the story was going, or what exciting new thing I could learn (my parents gave me a children's encyclopedia for my tenth birthday that I would carry around and read everywhere). So hyper focus on the dopamine hit of learning something new, I guess.
I do have a pet theory that many of us ADHDers develop habits to overcompensate but do so early enough that we don't realise they're learned. For example my room growing up was always super tidy, I literally never had to be asked to clean it and I'd know straight away if someone had been in while I was out. That really confused me when I got diagnosed but in hindsight it's because without everything having a consistent place I'd constantly lose things and never find anything.