Your comment show a lack of understanding of the condition. With ADHD, we suffer from difficulties with executive functions, like adhering to a planning, being able to chose to work on something... I have obsession: I can't decide on what. I can work at length on complex subjects, again, probably not the one you expect.

It's not a choice.

Medication is not a silver bullet, but it allows, as explained in the parent article to do those things.