Why would they be fighting NZ? Someone has to do their scaffolding and run security at clubs on King's Cross. I think you underestimate Australia significantly

Why would they be fighting NZ? Someone has to do their scaffolding and run security at clubs on King's Cross. I think you underestimate Australia significantly. They've geared up for a fight with nearby powers they (and NZ) have fought before. And if Aussie ever ends up in a stand-up fight against an invader, NZ will jump back in with them. Admittedly, the ANZACs haven't met the nearby power in regular warfare, only irregular warfare. But each country now has the measure of the others and make plans accordingly. Hence why Australia is very good in jungle environments. And why NZ military maintains close ties with Singapore's military.