Indeed, but how do we know what disease we are talking about when we can't identify it ?
Should we give them names ... Autoimmune ME, cluster ME, EBV ME, immune dysregulation ME, etc. ? Without such or some definition I think you are right, many discussions will wander off because not every disease type will fit the discussion and everyone wants to apply their type or idea or theory to the discussion.....
Just one of the many inconveniences of this disease!