Creamy.... You are showing your lack of understanding of the Oz airspace model.
Your quote of the Canadian doc is interesting but not relevant to this question.
The actual freq is not relevant just so long as it is standard. We chose 126.7 as it was the standard used in the US, just as we chose 1200 for VFR on the transponder.
In many countries the class for the lower levels is Class E, where there is an ATS service to IFR only, unless you specifically ask for and are granted flight following, which is always subject to controller workload. The majority of G in the USA for instance is below 1200ft or 700ft over airports.
As a result you have asked the wrong question!
If you were around and flying some 40+ yrs ago, it was a time when the great majority of OCTA when handled by FS on just one freq:122.1. As traffic increased more FS freqs were introduced. I suggest that at that time everyone understood the procedures and good airmanship was the norm. Many rural aero clubs used 119.1 back then before anyone knew what a CTAF was, but from a practical point of view it was about the same.
When NAS was introduced there was much discussion on what class of airspace our OCTA might be. Class F was the other option, but at the end of the day it was G. In many countries there is NO service in G, so we are not strictly ICAO as we provide a service.
Australia has a process that many other countries and their aviation industries wish they had. It is called RAPAC and it is perhaps the most successful industry forum we have. My information is that the majority of RAPAC's don't support the use of the area freq for general b'casts. CASA might have to listen!!