Ex FSO. The reason it is not simple now is that the NAS airspace change was not completed .
I believe we should either go back to the airspace pre 1991AMATS ( yes. And recruit another 700 FSOs ) or complete the introduction of NAS which was based on the North American system.
Try giving circuit or other announcements on ATC frequencies in the USA or Canada and you would be jumped on pretty smartly. It just not allowed!
It looks to me that there is no one in CASA who understands the approved NAS plan.
For example the current airspace has class C in the lower collision risk link airspace to non radar towers but then lower category class D in the higher collision risk tower airspace. Only dopes could justify that- no wonder the morale at CASA is so low!