Worth noting for the most part these examples are sports that "class" by a previously measured factors that have been proven to show one ability in excel in that particular sport while an adult or at least when someone is a older teenager. Sure they get these evaluation wrong sometimes which creates an occasional outliers, but on average the "class" pools you with the talent group are are most equivalent too. And in terms of the NCAA "classes" an emphasis on grade have also come into play along with some financial concerns as families evaluate the school side of that option. They were not divided up do to a person geography, an areas populations size, school districts, etc. So, a somewhat different argument of how classes is being handled. These examples would fall more in line with how a European Club system is set up than comparing it to HS sports teams. Not saying one is better or worse than the other, but its a different system based more on evaluation than location.