The last 3 years have been an anomaly. If you look over the past 75 years, records for Michigan like 9-2 or 8-3 were usually as good it gets. Some high points with Bo in the '70s and the odd years when things fell just right like 1997, but Michigan has never been a place where undefeated or 1-loss regular seasons should be considered the norm. That's why I argued that, pre-Covid, Harbaugh with three 10-3 seasons, a 9-4 season and an 8-5 season had already brought Michigan to its normal W-L level, absent a win or two over OSU in those 5 years and absent a conf championship or two.
https://en.wikipedia.org/wiki/List_of_Michigan_Wolverines_football_seasons