The whole selling point of NAS and the ALPHABET airspace was to enable any pilot from any country to come to Australia and fly or learn to fly in standardized global airspace.
This was supposed to lead to the grand saving of millions of dollars, and be the savior of the aviation industry in Australia.
This is what the traveling Dick and Mick Smith, John and Martha King circus was pushing at the forums. Nobody, at those forums or elsewhere for that matter, could fathom how the savings were to be achieved.
Now we're supposed to embrace "FAA Class D", whatever that is. Apparently it is different to ICAO D.
So much for the rubbish that was being sold then, and so much for the ill informed operational opinion we are getting now.