The are innumerable diseasese that are invariably fatal, so by your definition, there could be no medical specialists for those diseases.
what we're discussing is what is meant, or inferred by, the tem "specialist". this
is there even special training for me/cfs? who decides if that knowledge makes the person a specialist? if its merely someone who has put alot of time and effort into trying to understand a condition then the term specialist has little meaning. and me/cfs, by its nature, is a multi-system problem requiring, if anything, a non specialised approach. the specialist can never perceive the whole.