Following the races in Australia can be a little embarrassing for Aussie fans who follow European racing. Mostly due to the lack of geography in the areas where the race is best promoted for commercial reasons. Unlike Europe or North America, Australia is a mostly flat continent. South Australia has no real major mountain ranges, just the ancient worn down Flinders ranges. There is more challenging geography in the Snowy Mountains, Victorian Alps and even around Sydney.
But I think TDU is a good cobweb cleaner for the coming European season. So it does serve a purpose to get riders into shape for the upcoming European season. And climbs like Willunga and the Corkscrew seem sufficient to ensure it isn't just a sprinter bore-fest. Simon Gerrans, Richie Porte, and Cadel Evans add to the race's credibility. The TDU can also be raced in oppressive heat, even hotter than France in July. This makes it tough for riders coming from the European winter.
I miss the Herald Sun Tour. Genuine climbs, raced in the Victorian Alps with genuine long / highish climbs (>1,800 metres). Jai Hindley last won that race in 2020. But it won't get big crowds so it is difficult to promote.
Going back there was the Commonwealth Bank cycling classic conducted on the east coast (nearer to Sydney). A stage race also with some good climbs, including those used in the 2022 Wollongong Worlds. The Commonwealth Bank cycling classic was won by a young Jan Ullrich in 1993.