For the most part, I agree with a lot of what you said. I definitely wouldn't pitch 7 innings, 3 times a week, but I do think you should come out of the game when you are ready, but it is a coach's judgement to determine if he really needs to come out. Most kids will say they aren't tired whne they truly are and then injuries occur. I don't think there should be an exact pitch limit. I believe pitch count should be used as a guideline to give a coach an idea of where his pitcher's arm is in terms of fatigue. If a pitcher's count is near 95 or so, it is near time to take him out. If he is on a roll, let him throw a few more pitches or get a few more outs. If he is beginning to struggle, go with a fresh arm. Your bullpen should always be active whne a pitcher gets around 85 pitches or have a pitcher ready to go if the current one gets in trouble.