PE is a good example because different people have different physiology and will respond better or worse to different exercise schedules.
As an adult, people are so varied. The concept of forcing kids, who absolutely are as or more varied than their adults, into so much structure is cruel. I get that some people are lazy and without something telling them what to do they will happily fail. But school today is more about grinding then down than building them up. And they bully and harass each other as consequence.
