I’m almost certain that there is a correlation between young kids starting showcase baseball tournaments, travel ball, etc and the rise of major arm trouble.
Travel ball and showcase tournaments really rose to popularity about 20 years ago and that would fit into the ages of a lot of these pitchers coming down with arm issues.
Now, with that being said, most kids often go to personal trainers, instructors, and the like, but that doesn’t necessarily mean they are being taught properly, nor does it exempt them from the stresses of newer pitches.
Maybe that might be a starting point to look into, but I doubt that will change anything. Like California trying to ban tackle football.