As I said, it is impossible to have 1:1 teacher-student ratio in common education. You seem to assume teaching is just some easy job that anyone can do with little expertise on the subject. In addition to previous examples, we already have personal teachers and students to some extents: parents and their children. Well, we still have bad parents, and we have bad children. Your proposal only works if everyone has high intelligence and education and dedicates their time to teaching. For free! So how much of your time are you currently spending on teaching for free? 8 hours a day? 12 hours? 16?

There are people who mostly attend lectures and read little and do extremely well. There are also people who mostly read and attend few lectures and also do well. The more methods are available, the better the education.

My point in the context of children with learning disabilities was that they must be tended to by adults. I assume you are agreeing with that.