The conspiracy theorist in me thinks they did it this way to pressure Notre Dame into a conference. Imagine how ND is going to feel when they have a first round playoff game on the road in a white out in Happy Valley while two teams they think they are better than (someone like SMU, Boise State, BYU, etc) get byes into the next round because they are in a conference.
Also I’m not sure if they will really do this but I think the committee probably should drop ND a little in the final rankings because they don’t have a 13th game against a good team while everyone else is playing in a conference championship game.