The things shamans deal with are extremely practical. They break down parameters of normal historical reality. Magical passes are just one aspect of that. ↗
Take to every Gallon of Honey, three Gallons of water, and put them both together, and set them over so soft a fire, that you may endure to melt and break the honey with your hands. ↗
The chances of a person breaking through their own habits and sloth and limited mind to actually write something that gets out there and matters to people are slim. ↗