The Area controllers in the USA do provide a service to low level class E. However, they provide that service using a different set of rules (the Area rules) to those that terminal controllers use (who have less restrictive rules).
They also have a lot of radar coverage, and where they don't, it is extremely restrictive one-in, one-out type of service.
The environment is different in Australia, with much smaller aviation activity (as you well know). The sector sizes are huge in Australia, compared to the states, due to the lower activity levels.
But you have been told all this before.
I'd be interesting in hearing to which terminal accident you are referring to that could have been avoided by a procedural (non-radar) control service to low level?