I can understand why people don't do it. We weren't taught how to learn at school or college and when we turned up at university we were expected to know how. It took me a semester of alcohol fuelled hedonism, followed by screwing up, panic, then introspection to work it all out.
I imagine a lot of that could be avoided with some assistance from the education sector along the way.
My eldest wants to be a doctor so I've tried to share as much of my experience with her on how to learn so she doesn't have to make my mistakes as they still don't teach them any of this today, at least in the UK.