I'm with creampuff.
it is not only about transmitting your intentions, it is also about listening to and developing a situational awareness of conflicting traffic.
what use is transmitting on multicom, then switching to area frequency and transmitting then switching to the nearby ctaf and transmitting if you don't hear the call "
XYZ you are turning directly into my path..."
this is all regulatory incompetence in an area of aviation that was once so simple.