Pitchers have to stay off the barrel of the bat and the only way to do that is to stay out of the middle of the plate. The barrel of the bat is what allows hitters to literally hit HR's one handed especially with the rocket ship baseball they use in the ML's now.
The launch angle swing does make it possible to turn what used to be considered mistake pitches into pitches you can get away with, like a Change up but not in the middle of the plate. You can get away with that pitch more often now than before everybody was trying to launch. That is why LH pitchers now believe they can throw Change ups to LH hitters and get away with it, something you would have never seen in decades past. By the same token, pitches in the middle of the plate are more likely to get tagged and are more likely going to be extra base hits or HR's than ever before.
The Curve has clearly returned to the ML's in a big way and for all the noise about pitchers throwing 98, they are maybe throwing more breaking pitches than I can remember, maybe ever, all in an effort to stay off the barrel of the bat and keep the hitter from timing his pitch. The Cutter, much maligned as a junk pitch through the years is big exactly because it fools the hitter just enough to keep the ball off the barrel of the hitter's bat. What we are not seeing as much off from what I can tell is pitchers rearing back and simply throwing the ball past hitters. Kimbrel take notice.