Kids spend more time and do more homework in US schools than ever. Yet a BA today is the equivalent of a HS diploma in 1948. That’s because schools aren’t for learning. Never have been. They’re warehouses for state indoctrination.
Private schools aren’t much better, just different aims.
Actually, many private schools are better - much! In our city, there are many private schools because the public ones are abysmal. Everyone I know either sends their children to a private school or they homeschool. Both of those are far better options than most public schools - but that also depends on the area because some cities have great public schools that are still strong academically. Around here, it’s a no contest with a couple of exceptional public schools.