Harrip, you ask if there is "really that much difference" between Australia harmonising with internationally proven safe, non prescriptive, circuit procedures that clearly save money and a ridiculous proposal that has never been tried or tested anywhere in the world.
Well , yes there is!
Do you work for CASA? I ask because it is most likely similar claims have been made within the regulator for the last 15 years to prevent any commonsense being used on this issue.
Bruce Byron announced a number of years ago that CASA would move,where possible to less prescriptive and more outcome based rules.
Obviously no one takes any notice of his directions!