One of the things that alarmed me during NAS 2b was the number of statements from controllers on this forum that pointed out the difficulties of providing some form of separation in a see-and-avoid environment when they could not control both aircraft (IFR RPT and VFR).
You think that's bad? At least ATC can see both aircraft.Think of the poor jet crew dodging a VFR on the CTAF AND being directed around by ATC on the Centre frequency in non-radar E because they are conflicting with another IFR. Yep, here comes DICK. "CANCEL IFR". So what did that achieve??
Can't be VFR above FL 250
FL 200 actually, without CASA approval. Which is why E should never have been introduced above FL200.