Are you really suggesting that pilots making announcements and then using radio arranged separation on a frequency also used by ATC for separation purposes is not a safety problem? Surely you are not?
No other country I know of allows this. It only happens in Aus because the changes I introduced have been half wound back
Many ATCs have told me they don't like the present half wound back system but state it was forced on them and they can't do anything about it. Do you work for the CASA office of Airspace under Mr Cromarty ?