Philosophical question: Let's say there were no rules. Honestly, how big of a problem would that be? In other words, what percentage of high school coaches would overwork pitchers to a dangerous level? And, of those who were overworked, what percentage of pitchers would actually suffer arm damage?
My point in asking this is that I think we all realize we now live in a "better safe than sorry" society. But how severe was/is the problem that this rule was meant to address? I'm not suggesting it was a zero or a ten, I'm just trying to gauge how widespread it was/is, if at all.
Personally, I don't have a problem with a coach trusting a 17/18-year-old kid to throw 120 pitches. But that's just me - and I never pitched.