So what PROVIDES the much mentioned SEPARATION ASSURANCE between an IFR aircraft in E and a VFR aircraft in E.
Leadie I think you are stuck in a circular argument and risk vanishing in a puff of logic.
In A, B, C and D there is positive sep. In G VFR are required to use radio above 5000'. In a CTAF(R) likewise. Which leaves E as the bastard child.
Where are these studies? Where does it say E is cheaper than C?