I respectfully disagree. I believe that expecting NBs to be shamans/priests is the same thing as telling women to "shut up and make me a sandwich" or telling young boys to "stop crying and act like a man". it's just another societally imposed gender role.
People have a tendency to socially isolate people who are different. Tribal communities tend to push autists and genderqueer folk into the role of shaman too. It's a phenomenon heard about during the 5 year period where I smoked way too much weed and accidentally became a certified shaman.