In summary, the conversation discusses the idea that a more intensive learning approach, such as the one being advocated, may require a higher level of comfort with the material than the average teacher may possess. This is similar to the pressure students face in essay writing, where they must fit all their ideas into a strict format. The key is to identify the most important message and audience for effective communication.
Totally agree with the point he is making. However, it is a much more intensive way of learning and probably requires a lot more comfort with the material than the average teacher has (that's just my gut instinct with respect to teachers in the US). I can think of a similar situation with essay writing. I remember the standard form for an essay in middle/high school was 5 paragraphs: 1 introductory paragraph with thesis statement, 3 body paragraphs, and 1 conclusion. So for everything you wanted to say you worked really hard to shoehorn into that form. The "find x" here is realizing what and to whom you want to communicate.