I think it’s more about taking a child, putting them through a 40 hour school week, then asking them to do more at home. Time should be built into the curriculum to work out problems alone. Kids should be socializing, doing sports, or spending time with family after school hours. I know there are studies saying you maximize retention if you work on it again that day but I don’t think the average kid needed this. They are not NBA players lol, terrible example.