For a long time, I couldn't give a good answer.
My father outlines "The History of Madness" in his lectures. And the Wholistic Theory of Madness is a slow idea, its roots going back to over a century with my father adding the idea of Temperament in the last half century. Fast Ideas about "madness" have been around since Homo Sapens possessed language.
The roots of the Idea of Keirsey Temperament also go back to ancient times.
The root of this idea appeared just recently, thanks to Atul Gawande.
One the other hand, antiseptics met with a huge amount of resistence from "doctors" particularly "surgeons". Joseph Lister who invented the method in the 1860s and publish it in Lancet, using carbolic acid to kill germs. It took decades for the method to be adopted by all doctors and hospitals.
A Kuhnian "scientific evolution" is in effect here.
Adherents of the old ways, outdated moral, religious, economic, political beliefs, which were fast ideas in their time must be pushed to the side and lose influence and power that they hold on to for their dear life [purpose, job, livelyhood]. Ideas need to adapt, improve, and be robust to the changing and widening of their context.
So what about Keirsey Temperament.
Keirsey Temperament Theory is abstract, complex, and integrated. Despite the fact that Please Understand Me (PUM) and PUM II have sold four million copies world wide without paid advertisements, when compared to the simple traits slice and dice models of personality (e.g., A-B types, MBTI, Enneagram, DISC, MMPI, yada yada) people most often balk at learning something that is not easily explained in a few minutes.
Four Temperaments, Eight Roles, Sixteen Role Variants. Each description is broad: "applying" to millions of individuals. For most individuals learning a complicated and general theory is not something they want or interested in doing. Understanding takes WORK. Hard work. However, WHAT IS IT'S CASH VALUE IN THE LONG RUN?
Just give me a blue pill or the Cliff notes? Just Entertain me?
Someday complex science will not be celebrity science.
The Wholistic Theory of Madness is even more abstract, complex, and integrated: and it is mostly hidden. One of the functions of madness is to hide shame from the labelled "crazy" person and his/her significant others. The current fast idea of a "chemical imbalance" based on the old idea of bad juice is a big business.
The American "mental unhealth system" is crazy rich and a big soft comfortable-uncomfortable gulag.
It's a long time coming. It's a long time gone.
Feed your head. Feed your head!
I feel like I'm going mad in being one of the few who understand this. Something so useful yet resisted and ignored by the population at large. It's maddening.