The equipment requirements for Class D / G areodromes are the same. An RAAus pilot trained at a Class D aerodrome is only permitted to fly as PIC until they gain their RPC. The only way they can operate as PIC of an RAAus registered aeroplane on their RPC is to obtain an RPL, maintain a GA flight review and RAMPC or higher medical, why impose these restrictions?
The standard of RT from both RAAus and GA operators could do with improvement, particularly in G airspace. The trend seems to be constant talk, several inbound calls, every leg of the circuit, taxiing, entering the runway, starting the takeoff roll, exiting the runway. Put 6 or so aircraft in the circuit and there's no airtime to make the recommended calls.