It's more hard throwing guys and year round ball/training to throw hard that's tearing up arms. Guys that don't naturally throw hard, shouldn't be throwing hard but we've gotten all these kids trying to throw hard. Lots of poor mechanics and over throwing. Guys like Nolan Ryan didn't go work on throwing hard every offseason workout. He wasn't throwing weight balls etc. all the time. Long toss and strengthening the lower body was more priority. Old school MLB guys threw more innings too, so innings aren't the issue. Same with HS pitching, guys were piling up big innings. Reputable travel ball doesn't throw guys big innings either. Biomechanically, everyone can't throw hard, and shouldn't be trying to. Kids don't want to learn to pitch like a Greg Maddux because a premium has been placed on throwing hard. It's similar to kids standing on top of the plate trying to pull every ball when they aren't capable, instead of being a Tony Gwynn. (Rant over LOL)