That's why it works in the US.
Yup, exactly. Whenever you fly over the top of a Class D tower in the States at A045 there will be surveillance coverage. But you and I both know that at Towered aerodromes in Australia, with surveillance.........to the ground.........that a VFR pilot will be met with:
'Have you got a plan in the system'
'remain outside controlled airspace' (no matter what the traffic disposition is) I know how it works, got experience from both sides of the fence. And in both countries.
Go over to the States, hire an aircraft and see how it works, if you are not a pilot, arrange a security clearance, sit beside one of your tower comrades and watch them work it. While you're there, they'll explain to you the term 'cleared the option' something that will NEVER happen in ASA land.