As a controller who works the E airspace over Williamtown, I feel my six-pence is worth.
Although Ive never seen an airline bust into E above 4500 without a clearance. There is a much greater danger if they just do it, regardless of whether they are VMC or not, with hitting an IFR going the other way, or already in there.
If they declare IFR pick-up or VFR climb descent. Thats upto them, but they cant just bust into E and not say anything. and at the subsequent board of enquiry say, oh we were VMC - It wont fly.
IFR in E need a clearance. Reading AIP ENR about class E the only remarks I can see about the term 'VMC', Is the transfer of terrain clearance from ATC to the Pilot.
And, Dick stop going on & on about the USA. if its so bloody wonderful over there. Move. This is Australia, airspace & procedures need to be applicable to the traffic situation & requirements for australian aviation.
Not always is it what's good for the goose is good for the gander.