I think Dick is trying to say that anywhere else in the developed world IFR aircraft receive an ATC service at all times, with the applicable separation standards. Low level ADSB means ATC can apply better separation standards. However in Australia, AsA have elected to mandate ADSB for all IFR aircraft, without planning to provide that service. So what is the point of the mandate? What benefit - related to separation standards - is there?
Of note, it's also very interesting to see that Australia was the first to mandate ADSB, but has no plans for a SBAS, which has far more safety benefits that ADSB. Take this into account before stating I'm wrong - the rest of the developed world - which includes India and China BTW - have taken the opposite path, SBAS then ADSB. Safety before efficiency. I remember reading something about the priority order somewhere. Oh yes, day 1 at flying school