For some, it's because Buchholz uses actual class time as team prep time, I think some schools can't get past the bureaucracy to allow that. For a month over the summer, we learned about 4 hours a day from the class above us / Frazer, then for another 4 hours taught the class below us.

I think the state/national runner ups, American Heritage has copied this in class teaching method, among other Frazer tactics.