Tom Tango gives some insight into positioning in the batter’s box:
And:
Standing well behind the plate also increases the chance of reaching by catcher interference. There should be a negative trade-off of standing close to the edge in injuries from hit by pitches. This is why pitchers try to scare batters inside.
I’m often impressed at how the game evolves in the direction that analytics reveal are correct. Managers adjust their one-run strategies to the run environment. Pitchers and batters learn from positive and negative feedback that closer to the edge and farther back in the box is the optimal placement for a hitter.
This did not happen with shifting. Some overt shifting happened with very extreme players, like Ted Williams, but most was subtle. When I used to sit in the centerfield bleachers in Fenway, the outfielders would move with every hitter, but it was seldom more than a few steps in any direction. Some infielders would adjust left or right depending on the pitch that was about to be thrown. I understand that Cal Ripken would sit in on the pitcher-catcher meetings so he would know the approach against each opponent and he could adjust before hand.
At some point, most batters developed a singular swing. Instead of adjusting to the type of pitches thrown, or the tendencies of the pitcher, or the positioning of the fielders, or even the leverage of the situation, batters just swung hard to pull the ball. Mark Teixeira stands as a prime example of this. His BABIP fell off a cliff in 2010 as teams started shifting against him, but he just kept on pulling the ball.
In this case, the evolution of the game went down a boring dead end, which is a big reason MLB stepped in the change the rules. As we saw in 2024, defenses adjusted rather quickly to their limits, and batters still refuse to budge.

