I used to be really into the "power of the mind" and fell prey to psychobabble too. At first it was empowering and gave me much needed hope, but this lead to a series of humiliating reality checks or "adjustments" as the illness didn't respond well to such beliefs in action. I don't reject the existence or at least appearance of a mind-body connection in various degrees for different illnesses, but the notion tends to be misused/abused or overstated and used as a gap-filler. After personal experiences and researching the literature, I've grown very skeptical about major therapeutic claims.
The deceptive appearance of a mind-body connection in ME/CFS seems to arise from biological vulnerabilities rather than primary psychological problems causing psycho>somatic reactions in otherwise healthy people. However, the presence of post-exertional symptoms in response to both mental and physical activity does raise the possibility that cognitive and behavioural changes can be helpful when adjusting to illness limitations. I do not mean CBT/GET but acceptance and pacing for example, and I wouldn't rule out some mind-body techniques having some benefit for some patients.
I generally agree with the other comments posted on this thread. Also consider that "chronic fatigue" and some other generalized symptoms with vague descriptions associated with CFS such as "chronic pain" are common in the general population and are heterogeneous (in the usual sense rather than the Peter White for CFS sense). The prevalence estimates of chronic fatigue is about 10-20%, Reeves/Oxford criteria CFS is about 2-3%, Fukuda criteria CFS is about 0.2-0.5%, and Canadian criteria ME/CFS is about 0.1%. Patients meeting the new ME-ICC criteria are probably rarer.
So for every Canadian criteria ME/CFS patient (which itself isn't a perfect litmus test either) there are hundreds of people with "chronic fatigue", many of which have exclusionary medical or psychiatric conditions. Combine all this with a lack of accurate awareness, poor diagnostic precision in routine clinical practice, and misleading overlap with psychiatric symptoms. It is a recipe for disaster, quackery, psychobabble, and the illusion of control.
Chances of recovery are poorer as the criteria gets stricter. It is also possible to be housebound and bedridden without meeting strict ME/CFS criteria due to lack of other symptoms. However, some ex-patients claim to have had genuine severe ME/CFS meeting strict criteria and still recovered relatively quickly once using mind-body techniques after years of illness. There are a number of possible explanations for this, but we need better diagnostic accuracy and reliable biomarkers to help sort out the discrepancies.
I like alex3619's new signature: "If we have a psychosomatic illness because a physical illness cannot be objectively shown, how is a psychosomatic illness any more valid since it cannot be objectively shown?" A lot of the more extreme psychobabble claims about medically unexplained physical illness is often applied to classic organic diseases too eg the mind can cause and cure cancer, etc.