Why give any deciding committee ammunition too argue against a BIG team playing in a most meaningful game through bad SoS or losses?
The PAC is a disaster, the ACC is a one team conference, and the Big 12 has been seen as weak since this current 5 conference structure took hold. None of those three are seen as strong.
That leaves the SEC, which is strong by geography, but does more to mitigate opponent strength than any other conference and it gets ignored by the committee. They play more non-conference games, more FCS opponents, rarely (in some cases never) play road games, and when they do play someone outside the conference it’s a neutral site within the SEC footprint.
It’s a huge part of the problem in this sport because they intentionally make it hard to compare schools. The SEC and PAC never play each other, and in the rare case it happens it is in SEC territory. Kentucky literally never plays west of the central time zone. Florida hasn’t played a non-conference opponent outside the state of Florida since 1991. The mere idea of a home and home, like the other conferences routinely play, is seen as unfair to the SEC.
With the system so lopsided in the SEC’s favor, it’s not about making your schedule tough, it’s about going undefeated. The ACC has not been strong in the CFP era, but Clemson gets in. They have less margin than an SEC school, but so does everyone. If Ohio St could stop losing by 30 to unranked teams, they’d get in, too.