I agree. It seems that in this day & age, most commercial FM stations in Australia, both metro & regional, are ‘afraid’ of playing anything earlier than 1980. Notable exceptions are Breeze & Triple M in some regional areas (ie. those that carry the “Classic Hits” format).
I was recently in NZ for a holiday & there are a few commercial FM stations across the country that still plays plenty of 60s & 70s music, even the nationally networked ones, such as Coast, Magic & The Sound. Although Magic is on AM in the bigger cities of Auckland, Wellington & Christchurch.
Radio in NZ is generally so much better than in Australia, at least in the music playlists department, with a wide variety of formats to choose from, even in some of the lower-populated areas. They even have a dedicated 80s station in XS80s on the FM band in some parts of the South Island, such as Christchurch, Dunedin & Wanaka (where I was based during my stay).