The WA CTAFs are predominantly in the Pilbara, and the traffic is predominantly North-South bound jets, so not as difficult to mix with vs the likes of MCY where you have every aircraft type arriving and departing in every direction.
Throw in centre calling on one frequency while local traffic is simultaneously broadcasting on the other frequency then missing calls somewhere at somepoint is inevitable.
Flying RPT jets into CTAF's is f@cking bull****.
That should have been the ATSB summary.
Agreed, but too to realistic to expect any change.