Most of our plants and animals are well adapted to fires; many fires are probably beneficial and even the occasional hot fire does not radically change large areas of the landscape.
The 2003 Firestorm was something else. It was at the extreme end of heat and has resulted in changes to our fire warning system to include a 'catastrophic' category.
Large areas of Namadgi National Park were severely burnt, including the more vulnerable vegetation such as tall Alpine Ash forest and sub-alpine sphagnum wetlands. These habitats will take many decades to recover.