FFS. Is it really that hard?
Except that the RPT leaving Mildura didn't hear him because they switched the radios on 30 seconds after the broadcast.
They don't know about the guy who left Broken Hill for Swan Hill either, because he broadcast on Broken Hill CTAF, but never area, and even if he had it was before they were listening.
It's just a piece of the old system that has been resurrected for some reason. There's nothing wrong with it, except that it can't work the way people are describing without other bits of the old system. Specifically, everybody broadcasting on area, and someone listening, tracking aircraft and relaying relevant information that was broadcast before you were on frequency.
The aircraft I see when out flying are other aircraft flying from CTAF to CTAF, with no broadcasts on area. Aircraft taking off from unmarked strips are a miniscule risk to aircraft in cruise - far less than other aircraft also in cruise.