My own brother is a physician and even he is reluctant to accept this is actually a physical disease. First give me a diagnostic test he said. Physicians and other healthcare providers have been indoctrinated succesfully. Even I believed the bps model to be accurate in the beginning.
The thing is that doctors, psychologists etc mostly only read the introduction and the conclusions when studying a research publication. And that is what fatigue scientists know very well. They exaggerate the positive effects but one needs to read meticulously to find out how they performed the research, what patients were included, what measures were used which measures were not published and how they defined tresholds (still severely ill but so called improved) and last but not least how they changed the protocol or defined recovery post hoc. Surely I have mist some more methods to delude the public.