I get it, Scott Frost has made a lot of mistakes. No one is questioning that. If he does things differently or says something differently does he have a better team and a better record? No one knows for sure and you can't change what has happened.
As I have said many times, I would have been perfectly fine with TA firing Frost at the end of last season. He didn't, he is the coach for at least 1 more season. He has made a lot of changes to the program in the off season. I really don't see the reason to whine about what has happened in the past. I am not happy they the team hasn't been very good over the last 5 years, but there is not a lot I or anyone else can do about it. So as you say, hope springs eternal.