The point of my post was that the criticism of NZ being woeful that was made, is not relevant. Its only relevant of NZ was poor while most of the globe was good. The fact is, the world underestimated this virus. Therefore the accurate question is why
Re NZ, did we assess the virus and conclude that obviously it will infect well over 3 million by today? I doubt it. As Covid-19 is SARS2 (I think the official name in nCov-SARS2) I imagine many would be looking at SARS as a guide. Here for 8 months, big in the news. Did not do much at all. That probably didnt help
We had 60 flights day into AKL, thats just AKL. 60 x 200 where do we put 12000 people daily?
There was never a need to accommodate 12,000 per day. That 12,000 you quote is everyone. Closing the borders to all but New Zealander doesn't require accommodating 12,000 per day.
Closing the border means quarantine. I.e. enforced self isolation not voluntary. Otherwise its not closed. In any case its hindsught. SARS was a big deal that did nothing, and every country was "slow" Had SARS been Covid-19 1.0 it would have been different but it wasnt. To see SARS 2.0 and treet it as though it will be massively massively worse is not reasonably foreseeable.