I love it. It's all about keeping the status quo re the classification so no change has to be made.
That's because it's clear on the ATC side of the RAAF there is a shocking lack of personnel with leadership abilities who can make change,
Note the double mention of the discredited safety "as the most important consideration"
That's rubbish as safety is always limited be the resources available if aviation is to be affordable . As I have stated elsewhere Australia is the only country that has such a statement in the act. It's used to stop cost reductions and allow a one way ratchet if more expensive regulations .
Class D simply gives ATCs more flexibility to safely move aircraft . They can provide the same separation as C if they so choose . Most of the delays in the lane are caused by civil aircraft arriving from the west.
Compare Williamtown movements with Gatwick which has always been D.