Sorry – I didn’t actually mean that story structure depicts mental illnesses.
More that psychologists have many different models to describe particular MH conditions. For example, for depression we have the CBT model, the psychoanalytic model, the interpersonal model, the biological model etc. etc. Each model is trying to describe and explain the condition of “depression”, and each does it in a slightly different way.
Similarly, I think there are many various models which try to map and describe the intrinsic “shape” of stories.
I think it’s about finding the model that best helps YOU get to grip with the universal, archetypal shape of stories.