When I think when IHSA was at its best “parity” is what comes to mind for me as well. And I’d agree with the years you mentioned.Mid-late 90s into the early 00’s was the best.
I think there was more parity back then, especially concerning public vs private.
Back when state champions had several close games on their way to the title rather than several running clocks like we get now.
We go into seasons now already having a good idea on who is going to be the state
Champion before a game is even played.