No common sense prevails
A few years ago I was visiting a good Australian friend of mine in Sydney. He lives in a small ranch with a helipad about 1 mile from the edge of your Richmond Control Airspace - from memory it was NE of Richmond airfield.
I flew a Squirrel helicopter at 500 feet in CAVOK, tried to get clearance to land at his ranch but was made to hold 10 minutes or so at the boundary whilst a Hercules on IFR training landed. I could see his ranch, he could see me, Richmond airport was 12 miles away, I was at 500 feet, the Hercules was about 10 miles away and at least at 5000 feet possibly more and clearance was denied. It is simply not possible to collide at these separations.
Anyhow, I landed safely eventually but am amazed at the lack of flexibility and the poor planning that resulted in the HUGE size of your Richmond control airspace - much larger than Sydney, Melbourne and Brisbane added (it's true - go measure on a sectional map).
Other than that, I loved flying in Australia.