Try telling that to the people of Queensland, Western Australia and Northern Territory!
It doesn't work for them, as the closer you are to the equator, the less point there is.
They have had referendums on the subject, so aren't going to conform with the rest.
I was just reading today about a town in WA Tucla, which uniquely has a 45 minute difference. It's because they are very close to halfway between Adelaide and Perth, which are 90 minutes apart.
https://www.abc.net.au/news/2024-03-30/central-western-time-eucla-time-second-time-zone-in-wa/103243096