Creampuff. I am amazed at just how deficient you are on knowledge of the FAA
NAS airspace system which is current Australian Government policy.
Yes there are charts in the NAS- however there is no such thing as an en- route frequency for VFR to monitor so they can make announcements on ATC frequencies . This means US pilots are not obsessed with looking at charts in an attempt to be on the "correct" frequency. They remain vigilant with their eyes outside as much as they can.
With our multiple colour lines and different frequencies in many places depending on what altitude the aircraft is flying I bet many pilots are often on the incorrect frequency.
That's probably why VFR aircraft pilots do not reply a lot of the times when called by ATC in radar airspace.
I think the people at CASA are attempting to turn the en route un controlled airspace back to a "radio arranged separation" airspace that we had pre 1990s
It won't work but at least Bloggs will be pleased!