Leave it to the professionals.
Hey, Dick.
What is your obsession with North America.
Any professionals who has operated there knows their system is far inferior to the old Aussie system, unless you are a private pilot in a helicopter, who is getting in the way of the real pilots.
We now have alphabet soup airspace, identified by colours (Why isn't it Blue airspace or Green airspace) and typical American terminology that doesn't even hint at the function of what it is labeling.
I know what Melbourne Control does. What does Melbourne Centre do. Is the centre for tomato growers, nudist.
Next you will be wanting us to "Request lower.", to which you will want ATC to reply, "Expect lower momentarily."
Thanks Dick.