Let's be honest here, if not for the antiquated bowl system the NCAA would've gone to a 16 (or more) team playoff decades ago. Taking only 4 teams out of 130 to determine a champion when there is so little cross-country competition among top teams is actually a pretty lousy and inaccurate means of crowning a champ. Who's to say Utah's 35-0 win over California is any better or worse than Bama's 38-7 win over MSU? Well in the cfp's case, a committee consisting of biased administrators, former players/coaches, politicians, and professors (not making that up). It's a bit of a joke. There's nothing magical about 4 teams vs 8 teams and there's nothing definitive showing that only the top 4 teams as determined by the cfp committee are capable of winning a playoff. Heck, after 14 years of hearing the same arguments about 2 teams and the BCS, it only took one playoff to disprove the 2-teamer argument as the #4 team won the first cfp (and did so again a few years later, which is why that argument subsided very quickly once cfp in place). The #1 seed has never won it.
4-teamers want to claim that the cfp committee always gets the top 4 right when they can't even accurately distinguish between #1 and #4. I'm expected to assume they always get #4 & #5 right when they frequently screw up #1 & #4, uhhh nope.
In 2014 TCU was capable of playing with anyone, with their lone loss a 3-point loss on the road to a top 10 team. Not having them in the playoff was an injustice (they beat top 10 Ole Miss 42-3 in bowl game, leaving little doubt they belonged). In 2017 UCF was ridiculed as not belonging, but then went to a bowl game and beat Auburn by roughly the same margin as #1 seed Clemson beat them, showing they belonged. Last year OSU had to sit out due to one poor showing in what was otherwise probably the most impressive resume of any team in the nation while an undeserving ND team was escorted in with a much more modest resume but no loss. OSU beats ND 9 out of 10 times last year, but they sat at home and watched ND predictably get creamed by Clemson.
Again, if a playoff greater than 4 teams is so bad, why does basically every major sport at every level in the world use that model? The answer is that it's not bad and those sports are not saddled with an antiquated bowl system that is serving as an anchor to college football. It's the only difference and it's the only reason a 16-team playoff wasn't implemented decades ago.