Earlier quoted context omitted.
No, why? "Illness" sometimes is about the quantity, not the quality. If you enjoy the odd glass of wine once a week, you're fine, if you drink every hour of the day, not so fine.
But that's an orthogonal concern. Two people can easily display exactly the same quantity of, shall we say, ADHD-like tendencies. If one of them is a success for separate reasons, and the other one is a failure for separate reasons, why do we want to say that the failure, in addition to his other problems, also has ADHD? What do we learn from that? If the success has a lot more ADHD-tendency than the failure, how do…
You have two people with ADHD-like tendencies. One person feels they have found their own ways to adapt to their ADHD-like tendencies and that they are successful. Another person feels that they have not found ways to adapt to their ADHD-like tendencies and their life could be better if they found ways to adapt.
In this case, the actual magnitude is less important than how individuals adapt.