Your call: 2D or 3D electronic zone?
Briefly

Your call: 2D or 3D electronic zone?
"MLB's earlier experiments with ABS tried to "do the rulebook." In other words, the modeled zone was a three-dimensional projection of the plate, with the vertical dimensions established by the batter's height in their batting stance. However, over the span of MLB's testing, this led to a bunch of stuff that I guess no one (per MLB, anyway) liked."
"It was possible to barely clip a sliver of the "box" (3-D shape) part of the way through the trajectory of the pitch, getting a strike on a pitch that "had the plate" for only part of its duration "across the plate." Apparently, everyone hated this, except the pitchers that spent development time trying to nail how to throw pitches that got cheapo strikes."
A poll showed overwhelming support for an always-on automated ball-strike system in baseball, with 76 percent favoring it over challenge-based alternatives. MLB's earlier ABS experiments attempted to implement the rulebook's strike zone definition as a three-dimensional projection based on batter height. However, this approach allowed pitches to clip only a sliver of the strike zone box during part of their trajectory to receive strike calls, despite not truly crossing the plate. This outcome proved unpopular with stakeholders, leading MLB to abandon the strict rulebook-based system in favor of different approaches.
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