Too many pitching changes taking too much time. Foul ball after foul ball. Pitchers taking too long between pitcher. Batters stalling. Mound conferences all the time, etc.
Either put a clock on this stuff, or make the game seven innings long.
Foul balls are up, which is contributing to the length of games
Foul Balls Are The Pace-Of-Play Problem Nobody’s Talking About
" There were almost 14,000 more foul balls last season than there were 20 seasons earlier. In 1998, 26.5 percent of all strikes were foul balls. That share increased to a record 27.9 percent of strikes in 2017 and 27.8 percent last season, the top rates since pitch-level data was first recorded in 1988.
Overall, there were 26,313 more pitches in baseball in 2018 (724,447) than in 1998 (698,134). That’s the equivalent of adding 88 games, or roughly a week, to the schedule."