I really find it hard to believe that the researchers have an agenda to trivialize CFS, and that categorizing it as a mental illness is evidence of such an agen

I really find it hard to believe that the researchers have an agenda to trivialize CFS, and that categorizing it as a mental illness is evidence of such an agenda. Mental and physical well-being are linked to an extent that we can't really understand, so why worry so much about making a distinction? Every mental illness has a measurable physical manifestation, and every physical illness will have a mental effect. I think it's naive to try and find the direction of causality when they're so inextricably linked. In the end a mental illness is just as legitimate an illness as a physical illness and is probably linked to a physical problem with the brain that we just don't yet understand. Let's appreciate any and all legitimate research.