I've seen a similar effect in various other topics too, and propose the saying "the closer a subject is to its infancy, the clearer it will be taught". Two examples of this come to mind. The first is in the automotive industry, with early videos such as https://news.ycombinator.com/item?id=15122031 (and older discussion at https://news.ycombinator.com/item?id=8513209 ) as well as the detailed yet straightforward explanations in the service manuals of the time. The second example is with early computers; I remember an engineering text from the late 50s/early 60s that managed to include a surprisingly lucid chapter on assembly language programming, essentially showing how to write programs to solve numerical problems. Later on, microprocessor and home computer user manuals would also contain such information.
