The tactical swapping is part of it, especially since once a pitcher is taken out they can’t go back in for the rest of the game. A lot of the roster pitchers a

The tactical swapping is part of it, especially since once a pitcher is taken out they can’t go back in for the rest of the game. A lot of the roster pitchers are backups and relievers who don’t play many innings. The starters usually take at least 3 days rest after pitching.