What about the elite academies like Philip Exeter (and their sister schools)? How's the education there? They produced tons of tech alumni like Zuckerberg.
They are indeed grinders, and I consider families who go to such schools do push themselves. After all, they paid $40K+ a year for the education and the kids are either talented or are willing to prepare for the entrance test, and they are willing to take on the challenges given by the school. Besides, such schools are exceptions instead of norms.