If MLB wants to save time, they'll get serious about reducing mound visits, installing a pitch clock, preventing frivolous absences from the batter's box, and limiting the length of commercial breaks. Until they make a good faith effort to cut time where it makes the most difference, they have no business mucking with how the game is played.
One thing I have long hoped for and which (you'd think) COVID-19 might have brought about is a zero-tolerance policy on brawling. This is not an enjoyable part of the game and the "unwritten rules" that lead to this crap need to be left in the past. Anyone initiating or participating in a brawl should be suspended without pay - period.