I always felt like 12 was a good number if they would get rid of the automatic qualifiers. Finish top 12 & you are in - 13 and below, you’re not. Don’t have to worry about some 8-5 Champions from a G5 conference getting an automatic bid and bumping you out.
With 12 you don’t really need a committee, just go back to the old BCS formula and be done with it.
100%... Have human polls for "feelings" and computer polls for raw strength. If teams fuss just go ahead and do a 16 team playoff. Maybe have a 2nd sixteen team consolation playoff and get rid of all those crappy bowls or let them founder on their own. If you aren't in the top 32, no need for postseason. Plus or minus on the conference championship games.