Extending the Trading Hours

I come from Hong Kong. When I arrived in Australia, I felt very headache about the trading hours of shops. After 6 pm, the whole CBD became silent. In Hong Kong, we can do shopping until 10 pm every day. The most of the supermarkets will close around midnight. In Brisbane, that is a completely different world.
Recently, that sounds some improvements. The Queensland Government changed the laws to allow the large stores, which can open to 9 pm. A few days ago, I went to Coles. I found the trading hours has changed to response this change. On Saturday, the stores will open until 9pm. But I checked Myer and other shopping centers have not changed their normal trading. However, they have some extended trading hours for Christmas period. I wish all shopping centers can open until 9pm every day!