TLB,
Well, actually, MY ATS AIRSPACE Classification chart says regarding class D:-
Separation:- IFR from IFR
Services:- Air traffic control services including traffic information about VFR flights (and traffic avoidance advice on request).
That being said, I have never had to REQUEST traffic avoidance from VFR, I have simply never been cleared through the level of KNOWN (and in class D they are all KNOWN) VFR traffic.
So is that the crux of your argument? That D and E work when controllers ignore what the rules say and do what they know is right? In that case it WILL work in Aus when the likes of you and Dick simply tell the ATCers, "Look, it's really class C, but it makes us look good if it's got an "E" on it, ok guys?"
Makes a bit of a farce of it, don't you think?