Calling balls and strikes is super hard. Ever ump before? Even when the kids are only throwing 60s, it's still hard. The umps have the same amount of time to react to the ball as a player does. It's not an easy job. Plus, it's been played this way for over a hundred years. Would we have to rethink record books? How many called third strikes did the greats get that rookies didn't? It's an interesting debate and get why in such a technological world that we live in the mistakes get magnified that people clamor for robot umpires. If you're going to do it with home plate, I think you need to do it with all the other bases.