"Likewise, ADHD used to be called "being a child," and still is in most parts of the world."
I think it's more nuanced than that. Specifically, "being a child" in a very sedentary, physically restrictive world.
Strong, healthy, young males should not be driven in a car to sit at a desk for 8 hours and then driven home to sit in front of a TV. That describes a fair portion of first world male children and it is (obviously) a recipe for pathology.