Will the strike zone be fluid in its adjustment based on the a players stance from :
Game to game
Bat to bat
Pitch to pitch
Is it a three dimensional box that is recalibrated consistently or set in stone
Can the functionality of the box be protested by a player or team, what occurs if it becomes askew during a game can it be changed back? Will it be tweaked/checked inning to inning
If the integrity of the strike zone is given to a computer the myriad of processes that enable the computer to function in a manner that is superior to an umpire will also have to be enabled, tested and piloted in a less visual league before hitting MLB
It's as Roy said both the devil, and details.