I think the power structures are particularly relevant. For a large part this means that LC is still viewed as psychosomatic. Admitting that LC is physiological and at the same time can cause ME/CFS at a political level, doesn't only mean that one has neglected and forcefully harmed ME/CFS patients for decades, but also that other "programmes" currently running for example for "long-Q-fever" or "long-MERS-SARS" are nothing short of a harmful form of pseudoscientific money waste. Who would take the fall for that?
In countries like the Netherlands this leads to the most obsurd situations, where proper biomedical ME/CFS research is going to be conducted on the basis of pseudoscientific criteria. Damming the research from the get go. This is also a massive problem for Long-Covid research where a big European project that has been set up that includes the Lifelines cohort and is conducted by Finnish researchers who open state and treat both of Long-Covid and ME/CFS as FND's https://longcovidproject.eu/methology/.
We've got a battle on our hands, the more patients with differing diseases work together, the better chance we stand. The more outsiders we can get in on it too.