The problem is the current system is that it relies on authorities "doing the right thing". How long are these "emergency powers" going to be kept alive? How many years am I not going to be able to travel freely within my own country? Australia has just become a pseudo Authoritarian State with 7 Countries within a country. Police checking up on citizens all in the name of "safety". Interrogation at borders about "where have you been in the last 14 days?" Is this going to continue for years to come?
Whilst everyone pans the USA there is a reason why they behave like they do are the fact they don't have Police checkpoints all over the country and Police stopping people asking what they have been doing. The problem is in Australia the pandemic may be used as an excuse for a new normal. Good luck getting a State Premier to rescind their new found power.