Mr Smith. In your example
If still in IMC at WATLE the pilot is instructed by Sydney approach to "leave control area on descent- call Sydney radar 124.55"
We are set up for a classic CFIT as no descent altitude is given by ATC.
Lets say the pilot makes an error and descends too early and is about to hit a ridge in the famous Blue Mountains with peaks to 4000' amsl
Uhmmm, get a VTC or WAC and mark WATLE on it.
If you're at WATLE, going eastwards to Bankstown, then all the high-terrain is north, south and west of WATLE., ie. it is not in front of you.