I agree with both your points, but right now, they seem wedded to sticking to the game plan and no variance allowed. Bello is almost always fastball, fastball then 3 off speed pitches. That actually seems to be a pattern with all pitchers not named Crochet.
Varitek the catcher would see what a guy had and adapt the game plan on the fly. That doesn’t seem to be happening now, which is why I think perhaps Bailey won’t allow adjustment as the game goes on.