Sparky, It seems to me that if the NEC was to be applied only to electricians, then the other Codes would apply only to the trades that they govern.
That would mean that we could cut large holes through structural elements, cut A/C ducts out of our way, etc., and the other trades would merely have to say that "The electrician did it".
Since we are subject to the other Codes, I believe that the *^&%$# drywallers are subject to enforcement of the NEC...S