Rather than just talk about E or G - the more pertinent point is Dick,
that E over D is less safe than C (or D)over D and costs the same at Broome and Karratha, so therefore its required to be promulgated as such.
The argument keeps being presented as a choice between E and G. This just muddies the water. When it is really a choice between G,E,D (or C or A, for that matter). So why would you choose E? What is the cost benefit?
More importantly if there is no cost/benefit for the vast majority of airspace users - wouldnt it be a culpable act to mandate a level of airspace that is less than the highest affordable level of airspace?
There is nothing inherently wrong with E airspace (in the right spot) but if you are offering me E or C at the same price (at Broome and Karratha) - I'll take the C thanks.