The current thinking in baseball seems to be roll through as many pitchers as you need in a game to make sure the team is always pitching well into the 90s. The increased torque required for that seems to result in increased injuries and surgeries. Personal observation but I would guess it’s supported somewhere.
I imagine many great hitters of the past would be able to catch up to the speed with training but in their day they most likely never had to think about facing a 100mph pitch, much less a constant barrage of them.