Public school is what you get when you have one instructor per 20 kids with wildly different backgrounds, parent support and aptitudes. You need 10x better teachers with 1/20 of the load and much more involved parents. If you get all that, and certainly technology is the only way to get it at scale, then yes, kids can be done with academics in a small fraction of their day. They should be spending the bulk of their time in play and exploration.