Why does the southeast Australian trade wind blow from the inland?

The reason why deserts are widely distributed in inland and northwest coastal areas of Australia;

The main factors should emphasize the influence of subtropical high. From the latitude position, most areas are controlled by subtropical high all the year round (that is, subtropical high is the most fundamental reason)

1 Tropic of Capricorn passes through southern Australia and is controlled by subtropical high, which is hot and dry.

The Great Fengshui Ridge blocked the southeast trade wind (the moist airflow blowing from the sea) and made it difficult to enter the mainland.

There is a cold current on the west side to reduce temperature and humidity.