You don’t understand. It’s only a mental disorder because we have built environments for people that are not suitable for everybody. It’s possible that there may not exist an environment that makes any mental disorder not be a problem, but ADD and ADHD in my opinion is not one of them. Many countries don’t recognize these as a mental disorders because they haven’t built a society that causes problems for people with ADD or ADHD.
As someone with ADD I find it a bit ridiculous that because I can’t pay absolute attention on something I’m uninterested in while stuck in a room unable to leave that I have a mental disorder. The problem doesn’t lie with me, but with the environment I am in. But alas, that is just how a mental order is defined.