A thing I like about divisions is that a program like Northwestern can claim a West Title (and did) as a thing. They would have little chance to make the CG otherwise.
I disagree. Although the schedules won't exactly be the same, they won't be dramatically different if you go with a divisonless schedule with 5 permanent rivals.
Without divisions last year, OSU, Mich and NW woud have finished in a 3-way tie for first at 8-1. So then the question is how would they have broke the tie since OSU and NW did not play in the regular season. I have a hunch OSU and Mich would have made the CCG because
1) OSU beat Mich
2) Mich beat NW
3) OSU and Mich were ranked higher
4) NW sucked in OOC games
So I can"t see NW winning many tiebreakers last year, but in the end it did come down to the tiebreaker. Who knows, if NW plays PSU instead of Mich, maybe they beat PSU and finish 9-0. It could have easily happened with a slight tweak in the schedule.
If you go back to 2014-2018, I think the only time the 2 teams would have been different in the CCG would have been
2016 (would have been OSU-PSU rematch instead of PSU-Wisc)
and 2018 (OSU-Mich rematch instead of OSU-NW)
The other 3 years, it would have been the same 2 teams in the CCG.
2014 (Wisc-OSU)
2015 (Iowa-MSU)
2017 (Wisc-OSU)
Although I will concede that 2015 Iowa had a ridiculously easy schedule, skipping OSU, Mich, PSU and MSU in the regular season.