Major League Baseball changed many rules due to the COVID-19 pandemic. Most of them were designed so players and staff would spend less time in crowded dugouts and clubhouses. Seven-inning games in doubleheaders shortened time spent at the ballpark on those days.
Another rule change in 2020 that was kept in 2021 was having a runner placed on second base for every inning of extra-inning games. This rule did shorten games — in the two years, just one game was longer than 13 innings, a 16-inning affair between the Dodgers and Padres this past August 25.
This rule wasn’t used in the 2020 postseason and won’t be used in this year’s postseason either. And, per Maury Brown, it’s gone for good: