Midnight,
I agree with that whole list, and only make the following comments:
Any justification of the ADS-B mandate beyond FAA/Eurocontrol proposals for operations below 10,000/250kt IAS will not genuinely be able to be justified, the AsA/CASA mandate must be wound back.
With the extension of E airspace, the right of RAOz Pilot Certificate Holders to operate in E must be granted, subject to meeting the current transponder requirement. It was a certain Assistant Director, back in about 2003, who kyboshed what had already been agreed by CASA, that E would be open to AUF/RAOz pilots.
As far as I can see, many of the unacceptable cheap systems available only have a C129 GPS. Given Australia's traffic levels, a case should be made for these units to be used. For those that have a C145/146 GPS chip, any reason for non-approval needs very careful scrutiny, against the background of the very low traffic levels in Australia, and the proven collision risk probabilities above 10,000' being several orders of magnitude less the ICAO standard, effectively a statistical zero --- vanishingly small.
Nobody should forget that it is the Mode C Transponder that the ACAS/TCAS of a suitably equipped aircraft will see, not ADS-B Out.
Tootle pip!!