You're missing that they play two roles in this thing. They're not just an opponent on our resume. They're ANOTHER team trying to get in the playoff.
When 12-1 FSU is in and 11-1 Notre Dame is out, it won't be any consolation that FSU beat Clemson. It would have been better if they lost so 11-1 Notre Dame is compared to 11-2 FSU.
Think about it this way. Pretend this is the ACC championship game. Notre Dame is 11-1 and on the bubble. FSU is 11-1 also. Do you want FSU to win so our game against them looks slightly better? Of course not. You want them to lose so they drop out of the playoff picture.
I'm not missing anything. If we beat FSU, we're probably going 12-0 because we'd have to be THAT good to do that.
But let's say we have a let down game and end 11-1 in that scenario.
Look at our schedule and key wins vs. FSU's key wins:
ND Wins in order of importance: FSU, Stanford, ASU, USC, Michigan, UNC (take out one).
FSU Wins in order of importance: Clemson, Florida, V-Tech.
Not to mention the fact that we would have beaten them head to head. There'd be no argument for a 1 loss FSU team to play in over a 1 loss ND team, IMO.
I'll voluntarily leave the site if a 1-loss ND team gets left out in favor of a 1 loss FSU team, assuming that loss is to ND. It ain't happenin'. GO FSU!