Saying standards will be maintained and only woman who meet those standards will be accepted is nonsense. If that happens only a very small percentage will make the grade and you can bet for political reasons those standards will be lowered. Also it will be interesting to see how many women will injure themselves trying to keep up with the men.
The army is pitched at the average Australian male. The idea is in time of war you can drag an ordinary bloke out of the pub and make a solider out of him. The average woman is just not as strong as the average man. End of story.