The role of academia and texts in dog training is to allow new trainers to stand on the shoulders of giants. Dog training must always be based upon the actual training of real live dogs, but saying "you will understand with more experience" is not an acceptable response from a mentor to an apprentice. The foundation of mentorship is to keep someone else from wasting time making the same mistakes you did so that they might surpass you in ability.
Counterpoint: The teacher appears when the student is ready. I am a young, idealistic and modern person with a bias to having access to unlimited knowledge at my whim, without qualification. You cannot own knowledge until you earn it, and being told facts is not the same as internalizing knowledge.