Well I have spent a lifetime dealing with the psychiatric establishment and I can tell you emphatically that it’s bullshit.
Success is a lousy teacher that’s true, but also once you know the way broadly you can see it in all things.
More of the world is bullshit than not. Just look at prior eras. Were Victorian era doctors right about using mercury as a treatment for syphillis, but wrong that masturbation caused blindness? Or were they just morons who were wrong about basically everything?
That was only 125 years ago. Basically the blink of an eye. We are not much different from them and 125 years from now our current era will be looked at the same.