This wasn't something the OHSAA decided on a whim to come up with. It's been researched for years and finally in 2017 the NFHS mandated the state associations come up with a pitching restrictions based on pitches thrown.
If you've ever had the opportunity to listen to Dr. James Andrews speak on this matter, you'd understand that this was implemented not because of a "couple of coaches", but because this was/is a full blown epidemic of arm injuries due to overuse.
Far be it from me to disagree with a doctor, I'm an old timer and I am very familiar with Dr. Andrews. Arm injuries are more do to with the increase in speed and type of pitches than repetitions.
Does overuse happen, absolutely. Are there some rogue coaches who'll throw their #1 pitcher 4 days a week as many pitches as the kid can throw, absolutely. But it's an unbelievably small percentage and these pitching rules really harm the high school game. Look at the scores. Look at the rosters of high school baseball teams now. You have kids who have no business pitching, pitch just to get through games.
All I'm saying is this was done backwards. If you have a coach who is abusing players by overpitching them, THAT'S a school/ AD issue, don't get the state involved when it's not necessary. I'm about 100% sure if you polled coaches they HATE this rule, just because it's extra work. There is enough going on with just managing the team, then throw this in?
My feelings are kids, young adults do not throw enough these days, and it goes all the way up to the majors. You get ready to run a marathon by...running. Not by sitting. You get ready to pitch, by pitching. You build up so you can throw 100-120-140 pitches. We have a generation of major league players who can't throw 5 innings or 80 pitches anymore? And these are the best athletes with great training techniques?? Where have we gone wrong??