Just an observation.
I coached youth ball (under 13) for about 10 years in my former town. Then another 10 years (18U). I got to follow the kids very closely - given that I lived in the community for 22 years.
Every single kid that threw curveballs in little league did not make it to High School.
For whatever reasons - not 1 kid. Quite a sample size IMO.
Destroyed arms - all for plastic trophies in little league and senior leagues.
I always felt bad about it - always warned against - and ultimately - just gave up because I couldnt stop the dads from going down this road.
To this day - I question whether or not I should have ever coached - given that I couldnt stop this obvious abuse.