Dick:
We must have unique rules....etc
and
....why we have to be different to proven, safe, overseas practices. Designing our own procedures is like designing the proverbial Nomad...etc
You keep pedalling this theme that Australia's MBZ/CTAFR concept is unique to Australia. This is not so. (Underlining is my emphasis).
Canada, South Africa, NZ, and PNG also operate similar concepts to Australia's old MBZ or current CTAFR concept with radio use and calls being mandated. In Canada its called a Mandatory Frequency (MF) area, while in NZ, South Africa and PNG they are called MBZs. In NZ, transponder use is also mandated within some MBZs.
I'm sure if one searched long enough, other example countries would emerge.