Good point. But umpires also have the benefit of technology, I'm sure, by getting regular reports on their performance, especially behind the plate. My guess is that replays of their calls are a frequent thing after spring training games and a regular thing during the regular season. You think human umpires are obsolete, but I don't. And, by the way, Lou Boudreau, manager of the Cleveland Guardians, was the one who first used a big shift--against Ted Williams back in the 1950's. Computers have refined our ability to analyze hitting patterns, but the basic idea is 60 or more years old. And let's not forget that bold shifts incur risks. One is that a bunt to the other side is almost a sure hit if executed properly. Another, as Bogaerts demonstrated, is that the shift makes it a whole lot easier for a man on first to avoid an out at second and to get to 3B. As for looking at an IPAD, that's not much different from good scouting reports which go way, way back.