You raise a great point and why we have to go to 12. The NFL and other pro sports are typically 32 teams. You normally have enough cross-conference/division games so that the records reflect who really was better during the season. CFB has 132 teams and we simply don't play cross-conference enough. Hell, we have conferences with too many teams to know who is really good in the conference. The SECE used to be way better than the SECW, but that turned the last 15-20 years.
I'm with you - I think the B10 was weak this year and that their great defensive stats show how bad the offenses are. You think the PAC was really good, but might that be the opposite ... really good O's but that's because their D's are bad? Because you can't play enough inter-conference games to know, we really can't tell. Maybe Michigan is good, and Washington will get shown up when they face a D worth a shit. Again, we just don't know. We know you have a legit D, and O with QB1. We don't know about your O without QB1, but it would have been nice to play that out on the field. That's why you have to have a system that guarantees the champ gets in, and then enough at-large teams so that the conferences that have multiple good teams can enable those teams to get a chance.
I hope we are surprised each year when some teams that we didn't think were all that good actually turn out to be really good. This year it would be wild if Washington and Oregon really are better than everyone else, but we wouldn't know about Oregon because they are eliminated. What if in a 12 team CFP those teams run through every one? Now, I don't think that will happen often, but even if it happens every 3 or 4 or 5 years, that's worth some blowouts, IMO.