@glassbottommeg Have been working with Unreal on-and-off since 2.5 and their approach to documentation has always been "let the licencees figure things out on their own and share it on a mailing group / forum / YouTube, also let's see if we can appropriate their hotfixes to our bugs".
Unreal would still be using apples for navigation if not for my then (2009) teammate who just couldn't stand them and implemented a navmesh.