Can you smart guys learn me on what the biggest change in the game today is vs. back in the late 80's and 90's? Back then you had guys like Glavine and Maddux utilizing monster strike zones - yet only striking out 5 or 6 per 9. There were a lot more balls in play back in those days, which I assume is what Manfred is looking to mimic.
A few things stand out to me:
1. Relievers are significantly better and pitchers throw much harder.
2. Hitters have made a conscious decision that cutting down their swing to put the ball in play isn't actually more productive....especially now that shifting is a massive part of the game.
I heard some turd on the Fan the other day suggesting it's because they don't teach hitters how to hit anymore. He said hitters used to be taught to take the ball the other way and that's why there never used to be shifts. I think it's obvious that swings are analyzed and worked on a considerable amount more than "back in the day". IMO, shifts weren't used "back in the day" mostly because teams didn't have access to the data and/or didn't use it to their advantage enough.
Side note - Greg Maddux 1994 - 1.56 ERA and 7.4 WAR in only 25 starts. What a beast.