his article). From his point of view, "the BPS model for the past half century has served as a postmodernist excuse for eclecticism".
I have been critical of Ghaemi's book The rise and fall of the biopsychosocial model (see previous post and my book review with response and reply). However, I do essentially agree with his statement that the "BPS of the past half century is not the same BPS of George Engel in 1977" (see previous post). I can't really accept Ghaemi's simplistic definition of postmodernism as eclecticism (or nihilism), but I think he is right that modern psychiatry is eclectic and that "[m]ental health clinicians ... claim support [for eclecticism] ... in the BPS approach".
As Ghaemi indicates, Engel's BPS model comes from psychosomatic medicine. Ghaemi seems to define psychosomatic medicine as "the idea that unconscious psychology affect[s] ... the body to cause disease". Certainly this idea is present in the history of psychosomatic medicine from Franz Alexander. However, psychosomatic medicine is a wider concept and it now tends to emphasise excessive attention towards physical symptoms rather than stress as such or even unconscious motivation. Ghaemi is essentially anti-psychoanalysis (see previous post), which is why he calls the BPS model a "disproven psychosomatic medicine" model.
But the point of Engel's BPS model is that it promotes an integrated mind-brain understanding. It provides an explanatory anti-reductionist position for psychiatry (see eg. previous post).