I know Australian people in Europe who haven't been able to visit home in a year. I know second-hand that in China if you had multi-stop flights you needed to quarantine at every stop. I don't know what test and trace measures the AU and NZ governments decided on, but I'm pretty sure that I wouldn't like them if I knew.
And it's easy to say 'well, good, people shouldn't travel now' - but this is not just about holiday. These restrictions keep families apart, make it more difficult for people to care for each other. Imagine someone close to you is in distress and you can't go help them because of this, how would you feel?
I don't know about you, but I would not want to live in China, even it gets to zero covid. And I wouldn't particularly like being isolated in AU or NZ either.