When WifS updated the pitcher fatigue engine, it rendered the 3MT rather useless. The 3MT, in it's heyday, allowed you to utilize a pitching staff of 8-9 pitchers. This saved cap money as you could carry minimum salary specialty players and dump them when they went to arb. You could also sign the 20/54 DUR/STM combos on the cheap because no one wanted them. With the update, you had to carry 11-12 pitchers just like everyone else.