If you can get good overspin and take advantage of rough and bounce, aussie pitches can be good for spinners too.That's not really true.
There is no replacement of Gilchrist and Warne in Test cricket either, they were invincible in their department. Warne did poor vs India but he was a beast in Australian conditions which is a graveyard for spinners. He also did well everywhere. Unlike Ponting, his home conditions were graveyard for spinners and him doing wonders there tells us about the quality of the player and ability to thrive in tough conditions.
In addition to it, Steve Waugh was very underrated cricketer and did really well away from home.