Can anyone explain baseball pitching strategies?

The problem with the so called "Sabermetric" nowadays is that the stats do not take into account of the human factor. The stats mostly considered that two similar type of players are basically interchangeable with another at any time, kinds of like a socialist system.

When a manager like Boone do not believe in "hot players", I have trouble respecting him. Very often a hitter hit a couple of home runs, and then inexplicably, he is not in the line up the next day. Something like the arbitrary 100 pitches limit doesn't always make sense since every pitcher has different stamina. It is up to the manager to know the player, not dictated by the stats. Unfortunately, there is this cult like analytical system in place that every manager should follow or be barraged with questions by the media. That is why we gets a bunch of puppet managers like Dave Roberts and Aaron Boone in MLB to follow these system instead of managers with great instinct to manage by the seat-of-the-pants.