The first big Aussie outbreak was the cruise ship. NZ was lucky on that one: I assume they would have had the same media stupidity, ('They should have remained on the ship! Nobody said that! - just that they should have not been allowed ashore! There are now more cases than were on the cruise ship! etc) but I don’t know if they would have had the same quarantine failure. This was less important than was reported, but it had a big effect on public perception.
There is a state/federal split here. The federal government is legally responsible for quarantine. After a long period of other priorities, the quarantine responsibility was handled by the agriculture department, located in a rural city. When the cruise ship arrived, none of the people in Sidney had legal responsibility, or even knew who had legal responsibility (just “somebody else”). Even if somebody had thought of the agriculture department, they wouldn’t have had anybody accustomed to handling cruise ships.
If an infected cruise ship full of NZ citizens had landed in NZ, perhaps somebody would have had some idea how to handle it. Or perhaps not: it’s been a long time since 1919.
If my dates are right, NZ closed the border March 19, and Australia closed the border gradually from Feb 1 to March 20, so I don’t see a big difference there.
NZ did pre-purchase agreements with 4 international vaccine companies.
Aus chose Pfizer, AZ and two (??) local vaccines. The local vaccines didn’t make the cut, and there was no extra Pfizer available: Aus was unlucky with supply, NZ was lucky ??
Aus made a political decision a year ago not to fund mRNA manufacture. The government has changed it’s mind. I’ve heard private argument that the first decision was bad, not just in retrospect, but the reasons given having nothing to do with vaccine supply today or over the last 18 months. NZ made the decision 6 months earlier: I don’t think they had an existing industry ?? Which is probably why Australia said no, and took an extra 6 months, but again, I don’t think it has anything to do with the present situation.
The Australian/International supply chain has run out of low-volume syringes and needles, which has an effect on vaccine availability that is not discussed here or in NZ. I don’t know if NZ managed to avoid that.