Good point OP. It's not a coincidence that Miami couldn't miss in the 80's, 90's and early 2000's no matter who the coach was, but has had a bad run ever since.
Howard/Jimmy/Dennis/Butch had zero limitations on practice time and that matters. Kids from Miami need that additional structure and time with the coaches, because the high school coaching in Miami / So Fla is garbage and the kids come in much more raw than vs places like Texas, Georgia, or California for example.
It's why we see players on modern Miami teams make bone headed plays and mental mistakes very often, losing us countless games.
When the NCAA limited practice time, and limited contact periods with recruits, and got rid of football dorms, those rule changes hurt Miami far more than any other school. In fact I think they did it on purpose to harm Miami who was a most hated dynasty at the time the changes were made.