Folks,
For you who are ever ready to criticise Dick, he did present a safety case to CASA, who agreed and approved.
It is Airservices that is being bloody minded.
In most modern aircraft with an integrated glass cockpit, adding ADS-B Out is a major re-certification exercise, with software as well as hardware involved. A number of operators, at very considerable expense, have what Airservices euphemistically call "third party solutions" --- third party STCs, but this is not applicable for all aircraft.
As Dick has pointed out, Airservices has the capability to provide alternative separation standards, (such as when your ADS-B goes on the fritz in flight) but chooses not to do so.
Tootle pip!!