Just checked my old 2014 Sydney address (bottom left unit) NBN availability and it is still only ADSL2 even though it is on a very main road and only 250 meters from a very main & large exchange.
Lived at that address for 17 years and about once every 18mths to 24mths had to ring faults to come and drain the water out of either the footpath property communications pit or the very large (4 huge cover plates) end of street pit or reconnect the connections in the above ground Cross connect pillar, which was across the street from the afore mentioned large street pit and 25mtrs from the exchange, which kept shaking loose due to the heavy traffic load on the street. The connection screws literally came undone. One time I stood there and watched as they pumped the water out of the big pit and then wrapped the open connections in a plastic shopping bag. They are meant to be heat shrink wrapped.
Ever since they started installing, either Optus or Foxtel, their above ground cable network in the early 90's it has been a political 3rd rail. When Optus announced they were going to use their above ground cable network as part of the NBN they had the audacity to charge customers more for exactly the same service.
So they came up with 'Fibre to the Curb' FTTB which is fibre to your front gate and then connected to your existing copper to the house but wait there is more. In some Australian areas it is 'Fibre to the Node' FTTN which is fibre to the main street pit then copper to your house.
We returned home and settled in Tauranga in 2014 and immediately requested and got fibre thrusted under our 30mtr driveway to our house and we enjoy 80-90Mbps speeds. It was a very invisible and neat install.
We are just so lucky when it comes to broadband services and I include WiFi broadband, here in Kiwiland compared to our Aussie cousins.