I'm afraid I have to agree with Dick. if something works well overseas in an environment that we can broadly replicate in Australia then why not copy it instead of reinventing. the wheel each time?
it is, in my opinion, up to those those who want to reinvent the wheel or revert to 1950's procedures to demonstrate that their system will produce a better safety outcome which in my opinion, should be analysed by an independent ATSB as the final authority.
to me the combination of a profit driven ATC service, combined with a hidebound ineffective regulator produces the worst of all possible worlds for achieving safe aviation.
to put that another way, we seem to be copying the bureaucracy of Europe, the cultural resistance to innovation of the British, the (apocryphal) attitude to safety of Italy, the business ethics of China and the punitive practices of Saudi Arabia.