sure but, like i said in the part of my post that you quoted, school is also daycare. most parents don't want to have to think about wtf their kids are doing in the house until 11am or noon. maybe they're wrong and should take a more hands-off approach, but kids don't vote and they don't pay (much) tax. the system needs to cater to the needs of the parents as much as those of the kids.
Remote school. Lot of things could be learned and done from home. Then you can stagger your buses from 11am to noon for those who require communal food then group activities (art, sports etc.).