Not documenting it makes it harder to escape the scrutiny by rewriting your patent applications. It is far easier to game such a system if you know precisely how it works.
It's important to remember that the patent system is for the benefit of society. It achieves this benefit by incentivizing the individual. We must be sure to make sure when we apply the rules for the patent system we aren't capricious and discriminatory, but we need to be very aware that the benefits provided to the individual by a patent are not the purpose of the patent system, but simply the method used to a achieve it's true purpose. That purpose is very clear in the constitution as "To promote the progress of science and useful arts."
If they have a non-documented system for stalling, sidelining or giving greater scrutiny to patents yet have a 1500 page operations manual doesn't that strike you as odd?