Create an encyclopedia of ALL features

There are many, many features in WP. I talked to a level 2 tech guy who has been with you for 20 years. He said there are still, on rare occasions, features that customers have discovered that he knew nothing about. Please create an encyclopedia of functions and features, EVERYTHING that WP can do, and let some customers look it over to make sure it is user-friendly before you publish it. It should include EVERY step of every function or feature in the explanations and other details that your advanced tech people could contribute. the existing help files do not begin to provide an encyclopedic catalogue of all the features.