It seems to be a question thrown at every country at this point, and it remains relevant here.
Theoretical scenario: I could live with a mate who has an Australian passport (I’m British). We could work in the same office, drive the same car, get the same public transport, go to the same bars and restaurants and the same stadiums. We are both fully vaccinated for months in what is a waning immunity after 6 months.
Come Nov 1, he is accepted across the Australian border yet I am not. Why is that? Is it about a virus?