Regardless of the result of the potential PIA, the fact that TIBA exists now as the acceptable norm and the risks and workloads it puts on to Pilots and ATCs is a disgrace.
It is the professionalism of both pilots and ATC that prevent disaster and nothing else. I hear stories of the chaos when some of those east coast sectors between Sydney and Brisbane are TIBA.
Heads should roll at the executive and board level of AsA to have allowed it to get to this. Well done to the operational folk that make it still work.