I will say it again, FAA NAS style class D has no measurable differences to our present GAAP for VFR aircraft.
For IFR aircraft the pilot can remain IFR and get a separation service from other IFR aircraft in VMC-- if the pilot so desires.
This clearly has a safety advantage.
At no FAA class D airport is there a prescribed limit on the number of aircraft being given a service by ATC.
Why doesn't someone from the CASA OAR tell us why they are changing GAAP to D?
I dare someone to phone them and place the answer here!