My argument is that if your kid has:

1. A lot of physical energy and is forced to sit on a chair 8 hrs a day, they would be miserable without a way to expend that energy. If they get to burn energy before or intermittently during the task, they will focus far more easily.

2. A mind as fast as a Porche and you make them drive behind a Tractor 8 hrs a day (listening to a slow talker describing things they already know), they would not be happy. I think ADHD is really underutilized mental and/or physical processing power.

Some of us think and move like elephants and others like hummingbirds and we have to operate together. The educational system is often designed for the former, not the latter.