LOL,
No planes carrying passengers for months and compliance to lockdowns and closing borders on a state by state basis as cruel as it was to many who couldn't attend funerals , go to weddings , even go for a walk outside as it was in Melbourne was the reason why States could control numbers and yet despite that in Melbourne we actually bungled hotel quarantine which will eventually be the subject of a Royal Commission which resulted in 3 lockdowns to date totalling just over 6 months.
We have our contact tracing more advanced now so I suspect future lockdowns will be short and hard but hopefully no more will be required.
When you do what they did in New Zealand for example with their sparse population and their 6 week hard lockdown its not that difficult to reduce spread throughout the country.
Its when you allow overseas travellers to enter again that the community spread risk is heightened as has occurred in New Zealand and Australia time and again.