Harbaugh can't beat OSU and he can't win decent road games. But he literally never loses bad gets games. What is his worst loss? At home against a 10-3 MSU team? A meaningless Outback Bowl against South Carolina. He doesn't have blowout losses at Purdue or Iowa. He doesn't have losses to Pitt and Syracuse. That 9-11 wins per year with Michigan's talent. If you bring in someone else, who gets the same results, but beats OSU occasionally, but then drops a game at Indiana or Minnesota, is that better? That's basically Lloyd Carr, more big wins, more bad losses, solid end result. And yet was Carrs seat ever hot? Different times, WAY less scrutiny. Maybe it's a product of the CFP or bust way college football is covered now, but I remember really enjoying Michigan's 10-3 Citrus Bowl 1998 season. That season started 0-2 (so CFP gone), and ended with a loss at OSU. That would be a disaster now.
/unfocusedrant
I think that's a part of it, but with no satisfaction of beating OSU. Getting that extra month of self satisfaction is worth a lot.
Obviously that second part is harder to help because OSU just went supernova. In spots, there were cracks. Michigan was a road favorite in 2018 (3.5-4.5 points), even if they were a terrible matchup. The were battling in 2017 despite trash QBs and went down to the wire in 2016. But never had that extra little bit and OSU is about at its full power
But even if the success is near a level that makes sense, the optics are just not ideal
-QBs that range from a mess to modestly inconsistent
-A running game than never really feels that in control
-Offenses that always feel like kind of a chore (though the "non-modern scheme" stuff is mostly poppycock)
-Defense that is don't-bend-sometimes-break which seems to not have that top-end gear.
Then again, you have all that and they still win 10 games a year. If they get that QB play like 10 percent better, maybe flip a game a season and it's acceptable to most.
Then again, if he wins three more in five years, he's got the best win percentage of anyone but Crisler, Bo and Yost. Flip five games, and he's basically at the same level of Bo and Cisler.