It also comes from a bit of common courtesy and understanding the mission of the other aircraft. Several times I've hit a CTAF, RPT operating, I'll get out of their way no problems, most of the time I've offered, the RPT will say, no worries, you go, we'll slow down.
It's a pity the Australian Pilot's love for the radio and the sound of their own voices, their innability to learn what's required in a read-back and the belief that the radio takes place of looking out the window isn't used for good instead of guarding your arse because you might get in trouble because a radio call is incorrect.