The last time I watched baseball was in 2012, and there has been more frequent pitching changes, especially in the post-season.
For instance, this NY Post article states:
In 2018, teams set a new record by averaging a combined 8.41 pitchers per nine-inning games, according to data provided by Major League Baseball. That broke the previous mark of 8.20, set in 2017, which surpassed the standard of 8.00 established in 2016, which … you get the idea. Clubs teamed to use an average of 6.91 pitchers in 1999, and here we are now.
Why is this?