Perhaps we should understand what "integrated" means. Paraphrasing
the dictionary, connecting two or more elements is integrating. It
would seem that connecting a GPS does not define the system as
integrated. If two instruments can "talk" to one another they are, by
definition, integrated.
I agree with Will. When our rules were first written the instruments
now available to us were only a dream. Their relative cost to 25
years ago is not that much. If we were to remove the prohibition of
integrated instruments it could be a move to modernization of our
class rules.