I'm not trying to refute anything you said, just trying to make two points here.
First, it's hard to compare professional pitch counts, especially in the minors, to pitch counts at the amateur level. Many professional organizations institute pitch counts to protect their investment since they're paying some top prospects millions of dollars. They're trying to prevent injuries, just like amateur coaches should, but some professional organizations are overly cautious, like lifting a pitcher in the middle of an inning simply because of a pitch count. A good example of this is when the Mike Pelfrey was pulled from a Double-A game two years ago because he had thrown 35 pitches in the inning (it was the second inning, I believe) even though the team had made three errors behind him and his stuff was good that day.
The other thing I wanted to point out is that some coaches believe that pitchers should throw as much as possible. Leo Mazzone is probably the most famous proponent of this. And this doesn't mean always going out and throwing a ton of pitches, but if a guy hits 100 pitches and still feels and looks strong, it won't hurt him to keep going.
And for the record, I'm kind of on the fence about that train of thought. I've pushed pitchers to 120 pitches on rare occassions, but I've also pulled pitchers because of a pitch limit even though they're cruising along.