I remember 1969. Most folks had a single rotary dial phone in their house and the party line system was still in use. Some establishments still had outhouses, maybe that hasn't changed much cause now we have @PortaJohns. Sure the 69 Pontiac GTO was one of the coolest cars ever but it ain't worth $300k today because its modern. Pat Smith brought in a newer "modern" era showing you could win 4x even as a true freshman. However, the 4x thing didn't really take off until Cael showed the way. It was rare even then for true freshman to start, most just didn't have the defensive skills out of high school and needed a year in the room. The next new modern came after high school and club coaching improved so much that these kids had the defense and technique right out of high school or before. I'd say there was another new modern when Cael started coaching.
No one is saying 1969 is the "modern era." We simply have one long history of wrestling with a lot of changes throughout.