That still doesn’t solve the issue of the aeroplane doing BNE- PER as a domestic service and then needing to transfer terminals.
A330 arrives in BNE QF Dom from SYD tomorrow then gets towed to BNE Intl to operate BNE-SIN shortly after. Qantas tows aircraft to/from Intl / Dom / Intl at BNE just about every day of the week. That's their scheduling choices. I imagine much the same happens in SYD. But they can't do that in PER?
It's a pity the WA govt didn't see the need to chip in and build "fantastic facilities" in the other terminal for all the rest of their taxpayers international travel needs.