Exactly right. In addition, I believe correct mechanics, in addition to maximizing velocity, are part of a long-term arm health plan. My own son was practically unusable for almost two years as a pitcher due to control issues at a young age. People wondered why I didn't just have him slow up the velocity and find the strike zone. Many of them are finding out now. I see too many big guys in high school who should be throwing harder. I kow quite a few and also know that their velocity was harnessed at a young age and traded for "putting the ball over the plate."
Same thing happened to 2019Son in Little League. His coach when he was about 10 tried to get him to throw slower ("just get it over the plate") and I had to gently -- didn't want him to not respect the coach -- urge 2019Son to continue throwing as hard as he could. And if he is unusable at age 10 because of control, oh well . . .