Again, to whom? You think the players in 2021 who make the playoffs are going to feel any less proud of making it?
Nope.
Dilutes quality? Possibly and probably. BUT, i guarantee you will see some 9-12 seeds winning games. There is no doubt that will happen. So there may be some week 11 games that get out of hand (as they do now) but week 12 it may mean there are some better games because when some 9-12 teams win in week 11 that means they are a better team, and should make for a better week 12 matchup....
So when that 9 and 10 seed beat the 7 and 8 that could lead to a better week 12 game....