I'm not in Beta, never been interested in seeing the content before it is finalized myself. But my understanding is that Beta is not for "meaningful feedback" on things like design decisions that have been made such as skill trees and how they are implmenented. It is for some moderate degree of unstructured testing and assistance in find of show-stopping bugs -- e.g. client crashes, quest chains that can't advance, etc. Expecting any big changes once the code is in beta doesn't seem to me to be very realistic given the development cycle and a probably strong desire not to slip the release date...