Ferris, every IFR approach in the USA under NAS is in a minimum of class E controlled airspace.
There are many places in the US that have similar traffic densities, or even less, than our east coast city pairs.
Yet they provide a class E approach service using en route controllers.
But of course it's not possible to provide this safer service in Australia because your closed mind says so.
Make up as many excuses and cop outs as you like. I happen to know that you are wrong and there are plans in train to provide such a safer service.