I think people underestimate the amount of stress that a pro level pitcher is placing on his body... tendons, ligaments, muscles, etc... plus they have to do it over a full season, year after year.

Even in the short term, the history of pitching on 3 days rest is well documented... and it's not pretty. I don't have the exact stats on hand, but I just know it's bad. And figure that guys who pitch on 3 days rest are usually doing it because they are a great pitcher.

And lol at comparing what you did in middle school to the major leagues... how fast do kids throw in middle school?

Anyway, something I'm surprised that's never been tried.. instead of the typical 4-5 man rotation (and in this era, pretty much 5 exclusively), have a whole slew of pitchers that throw 1-3 innings, pitching at least every other game... or something like that.