Fair warning: My first example won’t be good.
Sometimes teaching is hard, because some types of learning are hard. There are deep foundational ideas that can be heard, and even understood, but not integrated well into a person’s identity. Some bigger ideas need to be digested over time and experience. Teachers who want their students to achieve a deeper functional understanding of certain ideas may seek shortcuts. But they will probably not find them. Understanding an idea does not quickly create the full paradigm shift in thinking, no matter how deeply desired that outcome.