Waaaaay too much.
I don't see Australia as country of its own any more, just bunch of independent countries wheeling to stick together IF they pleased.
Can't get this:
If international border control is responsibility of feds, why they can't just say ok, from midnight border in PER international terminal is open for everyone according to national plan. You are all fully vaccinated, so suck it up and deal with it.
You can blow up domestic terminal altogether if you pleased, but you can't stop ppl arriving from Singapore as it's federal border force you deal with on arrival, not wapol and you entering Australia, not just WA.