And that is their loss. ADHD is very much a cause whose impact goes far beyond just procrastrination. It causes people to be terrible spouses who are never there when they are needed. It causes lost friendships through blinkered social conduct. It causes persistent self hatred and anxiety and depression.
"you might want to try behaviour change first"
This is such a, forgive the harshness, ignorant way of thinking about ADHD that it makes my blood boil. Behaviour change works when the person in question has the capabilities of making that change stick. This is the equivalent of telling a handicapped person to try b-mod to climb the stairs.
It. Just. Won't. Work. A shortage of persistence cannot be solved through more vigorous exhortations towards greater persistence. Here's how I think of the drugs. The drugs lay the platform so that I can implement the behaviour change. They don't let me study better. They let me start studying in the first place, at which point, all the best practices and behaviour modifications can come into play.