As most who fly elsewhere on the planet and have done their fare share of domestic in Oz can attest. It’s a joke. Rest of the world manage with speed, vectors etc and seems to do a good job. Here in the States the clearance; “descend to 8000 then 250kts” seems pretty clear and does what the controller intends. Even the “descend via” here works great, with just the min altitude selected and minimum amount of chatter. Flying into Brissie the other day we got a ‘descend via” but with a lot of repetition alt and speed clearances that were printed on the chart.