One of the big gotchas with ME/CFS (I'm not a medic, but I do spend a lot of time working in a surgery...you pick stuff up) is that there's no diagnostic test, no marker that they can pick up and use to diagnose it. It's what's called a "differential diagnosis" - essentially, when you've ruled everything out, then what you're left with is ME/CFS. I think, as the condition has become more acknowledged, that medical people are more able to reach that diagnosis, where in the past they'd be more likely to dismiss it as a psychological condition.
Much of that has been true, albeit on a massively shorter timescale, the situation with Long Covid. People - including a lot of medics - have been running up against brick walls with their mental fatigue, lassitude, depression, which was just not seen as Covid-19-related when the main narrative around it was hospitals packing out ICUs with people on ventilators. We have had more time now to take a longer perspective, and it is clear that a lot of people who had Covid-19 are displaying a range of symptoms...which are not a million miles away from what ME/CFS sufferers have experienced. I believe that there is a classification for "post-viral fatigue syndrome" now, which might help the acceptance of the symptoms of things like ME, CFS, and Long Covid.
And there is bound to be a psychological component. It may not be that the psychology stuff is causal to the fatigue syndromes (though I am no longer surprised by how many ME sufferers experienced loss, trauma, or depression at some point prior to developing symptoms), but the syndromes are inevitably going to have a psychological effect, particularly since so many of them mirror those of more severe forms of depression, for example. So the two are probably intertwined, to some extent, and a two-pronged approach could be the best way forward.