In an 8 team playoff with 6 auto bids to the highest rated conference champs, divisions could be hurtful to the league for sure. That’s a scenario where I could see them going awayTo me that seems to be a big part of what is driving the Big 10 looking at ditching the Divisions.
12 I don’t think it matters as much because even at 12 if a 20th ranked team wins the conference the league probably still gets 1-3 at large bids. 8 there just aren’t very many at large bids to be had (which I prefer)
best playoff is still 12 with auto bids for any conference champ in the top 25 (up to 10) of a formulaic (not committee) ranking and then at large fill the rest