Wrestling and coaching in Indiana, I always appreciated the Indiana single-class system. I was lucky enough to also coach state finalists in both Georgia and Ohio who both use multi-class systems with same date/venue state finals. In my opinion, that format really took away some impact on being a state finalist and placewinner. I much prefer the single-class format.
I wrestled at a DII college and, at that time, DII champions were often invited to the DI championships and some did very well. There were some DI National Champions from DII schools. I remember one heavyweight from Pittsburgh-Johnstown and some others from Cal State Bakersfield.