I've lived for 3 years in Australia, have travelled to New Zealand, Sweden, Norway, Spain, the US and I live in France. Those are what most people consider "world class" walking countries, and yet I can tell you without a shadow of a doubt that the Aussies are the most skilled at building great tracks. The duckboards, signage, lookout building, scenic tracks is what the Aussies do best. In the US tracks are too short, too often paved (which destroys the wildness), and sometimes badly signed. In France, they're too numerous so you get lost easily, and there's a mix of old and new signage. Sweden and Norway don't seem to do daywalks : their tracks are designed for multi day hut to hut walking, they don't seem to have day walks in mind, and "great walks" are like very remote and very long. As for New Zealand, they're nice but it can get quite muddy, and duckboards often aren't here. So despite what some of you think (that there are too many safety signs mainly) about Aussie walking tracks, in my opinion they are world class already. I haven't done as much walking in NSW as I have in Victoria or Tassie, but the walking tracks in Mutawintji, Morton, Kosciuszko or the Blue Mountains are fine. What I hate is seeing what the Overland Track is now : you need to book months in advance, pay a steep fee, and pray the weather is on your side when you walk it.
Unfortunately it looks like NSW wants to cash in on the idea that backpackers are the tourists that pay the most money to stay at their destination : renting car, paying for fuel, food and park costs, long stay. But when I see how global warming is impacting NSW forests, increasing bushfires frequency and intensity, I worry about a government who wants to get as many people as they can walking multi day treks in those forests. I even wonder whether they thought about emergency evacuation in case of bushfire along those future tracks.