This isn't really accurate. Nebraska fans disliked him early on because he wasn't as gregarious as Devaney. The national media went back and forth between treating him like an elder statesman and a dottering old fool. His personality hurt him with the national media during the intense heat of the LP scandal amid other scandals. Go back and rewatch how he handled Bernard Goldberg's question at the press conference where he asked Osborne if he'd feel differently about LP if it had been Osborne's daughter that LP had assaulted. It was a brutal question, but it was fair, and Osborne didn't know what to do with it.
I love Osborne as much as anybody outside of my network of friends and family, but we're putting a false patina on him when we remember him this way. Yes, it definitely helped him with the Nebraska media by the 80s and onward that he consistently lowered the expectations for recruits and young players, but this wasn't popular in the 70s, and there were always sharp knives handy, ready to attack whenever the team stumbled.
Frost and Osborne have very different personalities, but they share some common traits that work well for the Nebraska head coach to have. If Frost is winning, none of the criticisms being leveled would matter. The inverse was also true for Osborne in December of 1990 and early 1991 after blowing a big lead to Colorado, getting blown out by Oklahoma, and then getting shellacked by Georgia Tech. I heard him speak that winter: he wasn't in a very good place.