From the Act:
12A Minister may give the Board notices about its strategic direction etc.
(1) The Minister may notify the Board in writing of the Minister’s views on the following matters:
(a) the appropriate strategic direction for CASA;
(b) the manner in which CASA should perform its functions.
(1A) Subsection (1) does not permit the Minister to notify views in relation to a particular case or a particular holder of a civil aviation authorisation.
(2) In performing its functions, the Board must act in accordance with notices given under subsection (1).
Cream puff says - Successive governments have deliberately chosen to limit their control of, and therefore responsibility for, CASA’s activities
Seems to be control and responsibility implicit in the Act.
The same as you, I feel that nothing will be achieved.