GaryGnu, you state:
The world is mandating TCAS II for 19 + pax and 5700kg + aircraft.
I think you are getting mixed up with ICAO recommendations. The 5700kg one sounds like ICAO – where they do not realise that it is the number of passengers that pay for the higher level of safety, not the weight of the aircraft.
Anyway, which ever way you look at it, Australia is lagging behind what leading aviation countries are mandating.
By the way, why is there no comment from the AIPA, AFAP or GAPAN? Is it all too obvious and simple?