The US has 1 ATC per approx 14 aircraft, AUS has 1 ATC per approx 22. On average, per head basis, AUS ATC control more aircraft each per day than a US ATC does.
You say that like it's a badge of honour. How is it more efficient if it's not more efficient? Airport movement rates alone blow your 'argument' out of the water. Your argument couldn't more utter bull**** than if a 12 year old in vege maths came up with it.