The trees drop huge amounts of bark, branches, leaves, etc, that don't rot (because high heat and lack of humidity), and that have to burn. It's a very different environment from Northern Hemisphere forests, there's no thick soft layer of damp, rotting leaves. It's all just sitting there on the ground waiting to burn. Bark peels off the trees in great sheets, falling to the ground where it sits there until it burns. Leaves pile up in dry drifts, waiting to burn.

You could chop the trees down, but that would leave you with no forest. It's not just mature trees that drop fuel, even growing trees do this.

If you have a forest in Australia[0], it has to burn regularly. It's not like Europe or America, where you can cheerfully build your house in the woods and it's all very pretty. If you build your house in the bush, then you have to cope with the fires.

Good to see the Guardian article talking about adaptation for once. One possible answer is to create houses that won't burn, and that are sealed from the heat and smoke.

[0] I gather that Tasmanian forest are less reliant on fire, so the situation may be different there.

Quite a lot of native Australian flora has adapted to bushfires and requires fire to drop seed or germinate. eg. seed pods that open after being burnt, dropping the well protected contents onto fresh, fertile ash.