But at the levels in G where the collision risk is highest, transponders are not mandatory for VFR.
Transponders are mandatory for VFRs in E at whatever level (unless the aircraft does not have a continuous power source and is operating below 10,000’).
I can now see the fundamental gap in your understanding, Bloggs. You think the collision risk is higher above 5,000’ than it is below 5,000 in the vicinity of an aerodrome. Do you think all the ultralights buzzing around in the vicinity of e.g. Mildura have transponders?
Take a deep breath and think about it, please.
Back Seat Driver: You’re forced to do it because of the likes of Bloggs (whom I’m sure the bean counters in the airlines love), not because of the likes of Dick. Do you think Australian E is less safe than Australian G?