Balloon. Extraordinary ignorance and resistance to change.
The universe will know because the pilot will look on the map for the nearest VHF ATC outlet ( or get it from the " nearest " feature on the gps ) and then state " Melbourne Centre. Mike Apha Mike , request" . Melbourne Centre will tell the pilot to standby or go ahead with the request.
And I can't see how It's relevant whether the calls are mandatory or good safe practice.
If I am about to taxi and enter the runway on even a dirt strip I keep a good lookout and also give the recommended calls. Why wouldn't you? Could be an aircraft about to land coming out of the sun. It's happened.