Are foul balls good or bad? For whom, the pitcher or the batter? I found a couple of short columns on the topic that did some research that examined it within the frame of a single plate appearance, but foul balls are so contextually relevant. Number of outs, baserunners, pitch location, pitch counts within the at-bat, pitch counts within the inning, pitch counts within the game...
With how pitchers are handled these days, it seems like being able to extend at-bats, even if the outcome favors the pitcher, can have significant effects throughout a game or series, when considering bullpen usage. So, is being able to foul pitches off a skill teams would want to promote? Or does the inherent passivity in such a skill too detrimental to slug to have value?
Anyway, I've had a number of these thoughts lately without anywhere to put them. Feel free to ignore my initial post if you have your own questions that have been rattling around your brain.