I'm not saying it hasn't worked well for them in the short term but it does feel like there isn't a long term plan there, other than a continuation of the current situation.
Edit: I should add I have some interest in this in that my brother and his family live in Australia. We haven't seen them for a couple of years and they have just been told that their borders are unlikely to reopen before 2023. As a result my brother was unable to come over here when our mother was dying of cancer earlier this year.
I read an interesting article recently (can't remember what/where to link it) about countries that have, in the main, dealt with Covid pretty well, certainly compared to a lot of Western countries.
The problems those countries are now facing is their exit plan strategy. Obviously Australia and New Zealand featured quite a bit, along with some south east Asian destinations. They have generally managed to supress the virus out of their communities, but with vaccination rates quite slow and the Delta variant seemingly easy to spread, they face some tough decisions on the best route out of the pandemic, and at what cost from a health and wealth standpoint.
I see Sydney have had to extend their localised lockdown for another week.
If you don't have many people fully vaccinated, and not many of the population have had it (Covid), and you're facing a variant like Delta that can sweep through communities and cities, it's a bit of a recipe for disaster.
I'm not sure how true this is but I've also read some pieces and comments about criticism for the Australian government, with people accusing them of playing down the importance of getting vaccinated, which might explain the relatively low rates and uptake at the moment (no doubt supply issues too).
PS; sorry to hear about your mum.