Another overlooked advantage is the enormous group of peers who are learning the exact same material as me at the same time as me.

Exactly. The peer pressure. It's not the same if those peers are merely online; and sometimes you don't even have that.

Perhaps one day we will have something analogical to coworking... colearning. I could imagine colearning "schools" where people come to learn from online materials, and then discuss with their peers. But there would have to be many people doing this in the same area, so that you could always find people learning the same thing as you do.