 Their arms are good enough that they can play deeper. That means less balls get through the infield as well. So it's harder and harder and harder to get a hit for so many reasons. And the easy thing that old crusty guys who yell at clouds, the easy thing for them is to say, well, nobody cares that they strike out anymore. Yes, they do. They don't want to strike out. The pitchers are witches now, and the defense is better than it's ever been.