Learning is a nontrivial skill even though it has historically been treated as such. It requires an embodied understanding of concepts from basic cognitive psychology, expertise theory, behavioral-affective psychology, metacognition, and more. Until people stop with the platitudes of "learning how to learn is important" and start teaching/training the subject directly as a skill that must be acquired, this will not change.

Simply showing a learner a few slides on spaced retrieval will not cut it.