You need to ask questions like that of the people who wrote the things you're enquiring about.
My pragmatic approach says that it's worked OK for many years and it does not appear to be broke. It would be good if a way could be found not to throw the baby out with the bathwater of EASA's standardisation.
We already have an NPA proposing that individual States can designate airports for which a Moutain Rating will be required. Why not allow States to designate (if they wish) airspace in which the privileges of a national qualification may be exercised?
Just an idea....