There have been many wonderful ideas and concepts for education systems over the centuries. They have/had different, sometimes contradictory philosophies. Most fall short of their values and ambitions, regardless of what these are. IMO, the pressures leading to degradation are all somehow linked to universalization: (a) Resource constraints. Student/teacher ratios. The availability of good teachers, at scale. A great…
Mandatory education is still probably better than the alternative but it does seem to create a constant tension: the system has to serve students who want very different things from it
A school system I attended when I was young divided classes between academic and social --- social classes were attended at one's age level, academic classes were attended at a student's ability levels, I believe that there were also trade school tracks, prompted by students taking Sloyd Woodworking claseses: