Indeed, in the now distant past the application notes from companies like Linear Technology, and many others, were a treasure of information from which one could learn more about electronics than from university textbooks.

Sadly, such great technical documentation exists no more. The companies that make such products are no longer your business partners, but they are adversarial entities, whose only goal is how to confuse and to fool their customers into paying as much as possible for products whose quality is as low as possible.

Educating your customers about how to better use your products is no longer a business goal. Another current thread on HN is about the fear that the huge decline in the quality of technical documentation during the last 3 decades will be accelerated by the replacement of professional technical writers with AI.