The reality is that a conference that's strong top to bottom and has some upsets looks worse than a team that has one or two good teams that beat up on everybody else.
Consider this scenario where you know how good teams really are::
Conference 1 has teams that are legitimately ranked (I know, that's a myth)
1, 2, 5, 10, 12, 15, 19, 25
Conference 2 has teams ranked:
14, 29, 36, 43, 49, 55, 70, 90
The #14 team in conf 2 goes undefeated
The 1, 2, & 5 teams are each have 2 losses due to the relative parity in the conference.
Even though conf 1 has 5 teams that are better than the top team in conf 2, the undefeated team in conf 2 is heralded as a juggernaut and makes the playoffs where it faces teams from conf 3, 4 & 5 who have some 1 loss teams. That #14 team now has a great chance of winning the NC even though they are not even close to the best team.
Yes, this is a hypothetical, but the point remains that any given conference is probably better off with a couple teams that are much better than the rest (ideally one in each division) than having a whole bunch of really good teams that beat each other up all season. Playing less conference games is also a good thing.
The bottom line: A NC in college football is problematic at best and a joke at worst. Also, as noted above, if the same teams are always winning the conference and/or national championships, people stop caring (other than the teams that make the playoff). Why care when it's the same teams every freakin' year? I'm amazed that it's such a hot topic of conversation here. I lost interest decades ago.