> But the interesting observation is that billionaires don't learn from experience.

This is my personal speculation, but self-learning can be extremely helpful for people with a lot of investment in a specific topic and high intrinsic motivation - a description likely to fit most people that made a vast fortune by themselves and their usual peer group. This is probably a serious filter bubble making them believe that self-learning is the way forward for everyone, since it worked for (nearly) everyone they know.