AIUI, it is politically absolutely vital to not give the "god appointed guardians of IR purity" any excuse for saying they are sharing airspace with less capable users, as that would lead to segregation by airspace class, which would destroy the private IR.
Agreed.
But I'd also point out that they have no problem sharing the airspace with both IMCR pilots and VFR only pilots, and pilots of deregulated aircraft, when it suits them
Some regularly jump through class G airspace to save some fuel.
Other in fact operate out of class G airspace to make some profits.
They are already sharing the airspace
I agree though, that that such an argument is not likely to bear fruit