A lot of domestic flight plans do not have the alternate, if any, on it and as an Approach controller you don't have time to keep an eye on weather/NOTAMs for those alternates that you don't regularly receive at your console. They have to be requested from the system and could be amended 5 mins after you requested it and you wouldn't know. Alternates for Cairns can vary from Mareeba (10mins away) to Sydney or Alice Springs in the wet season.
When ATC did ops control, it included a watch on destination and alternates, If we can't watch the alternate, the company will have to do it, so since they will (should) have the system in place for that, they might as well watch the destination as well.
The point I was making is that a controller wouldn't need to scan or request anything, TAATS could work out who needs what when, and direct it. It could also just as easily go to the Shift Manager and/or the airlines ops direct.
If the airlines want an ops watch on their altn, all they have to do is put it/them on the flight plan.
We already have a computer that has all the necessary data to automatically ops watch every IFR aircraft in or entering the Australian FIR, why not use it?