That's it in a nutshell. Nobody has the balls to stand up to the NAStronauts and say a 2500ft D CTR in unsurveilled airspace doesn't work, given that there is now a CAR - effective only 2 weeks ago - that mandates radio carriage and use at every "proper" airport in Australia. Hardly a consistent position to then allow a no-radio VFR to swan over the top of an RPT CTR at 2500ft not talking to anyone.