With the greatest of respect, EVERY major airport in the United States is surrounded by Class E airspace in the climb and descent phase of flight. The highest Class B airspace extends to 7000 feet above ground (possibly 10,000 feet at one or two airports) - Class C about the same - ALL the airspace above and around Class B, C and D towers is Class E.
If you cannot see VFR traffic because of the deficiencies of your system [any system, not specifically Australia's system] - then the obligation to pass traffic in respect of observed traffic cannot be met - but the designed procedures for Class E airspace are still satisfied.
Pilots operate in this airspace comfortably and consistently on a daily basis.
We stand by all previous posts - any change to current procedures or airspace design MUST be accompanied by appropriate studies, and the contention that appropriate levels of safety are provided explicitly proven.
This thread was meant to defend Class E as a valid and legitimate airspace management option - it is NOT about WHERE it is applied in Australia, or HOW it was implemented.