@cstross It was eye-opening for me to try reading The Hero with a Thousand Faces and not just derivatives. It's obsessed with Freud! I had always heard things like "the Father is metaphorical" but the original is very clear that the gender of each character matters immensely, for Freudian reasons. It really undermined my remaining faith in the system.
Then I learned about kishotenketsu and how the Hero's Journey doesn't actually work to describe many stories anyway.