Neither was it needed because the answer is so flippin' obvious.
Bloggs you've got gold bar blinkers. Underneath the rarefied atmosphere of the the high flight levels we are being forced to adhere to the same rules.
A GA IFR aircraft is still mixing with non ADS-B VFR aircraft and non transponder RA(Aus) aircraft.
I get no benefit from reduced separation or priority handling.
At a guess there are maybe 3,000 IFR aircraft (1/3 the GA fleet). At $25k each that $75 million.
Let me repeat that slowly for you. S.e.v.e.n.t.y F.i.v.e M.i.l.l.i.o.n D.o.l.l.a.r.s.
The GST alone on this is $7.5m. Plus the 2% duty on the import of the hardware is probably another $180k.
This is 50% more money than the government has just refused to pay to maintain a fruit processing industry in Australia. And this cost impost on GA has been done without a whiff of analysis.
The FAA did this analysis and saw no cost benefit in mandating ADS-B. So did Canada. So did the EU.