Sure, but if you fail at the beginning, how are you meant to build that skill?
If the author continued to require in-depth explanations of the core concepts again and again over the entire length of their education, sure, that could be an issue. The reality is that over time, most people are going to learn how to approach the issue, how to best self-teach, etc... and get past it.
If the author continued to require in-depth explanations of the core concepts again and again over the entire length of their education, sure, that could be an issue. The reality is that over time, most people are going to learn how to approach the issue, how to best self-teach, etc... and get past it.