Many remember this fiasco 1997 Marlins Brave Livian Hernandez playoff game? About the most egregious example i can remember of an umps zone deciding game.
https://blogs.fangraphs.com/lets-consider-eric-gregg-and-livan-hernandez-in-the-1997-nlcs/
2015 Game 6 vs KC still pisses me off. We are facing Wade Davis and Pompey gets to 3B. We have Navarro and Revere up. All of a sudden the zone changes and balls that were called balls all game are now strikes destroying their ABs. Davis loved to use the splitter, so the difference between 3-1 and 2-2 count was monumental. Next thing I know we lost, and Revere is beating a garbage can and my 7 year old boy is bawling his eyes out in shock. No, we don't need umpires.
We need robo umps with a consistent accurate strike zone. It would cut down on MLB K rate and improve the game.