Ah, that's interesting.
One of the odd quirks about Australian Anglicanism is that there are a number of very common practices - like blessing of oils, or use of holy water - which are basically not acknowledged in our prayer books at all. Our rite of ministry with the sick includes anointing with oil, but provides no instructions or notes about the blessing of that oil, or even a requirement that it be blessed at all. And some of our colleagues would feel perfectly comfortable using ordinary olive oil, or the like.
I can see your point, but I think I like that the oils become something shared, in a ministry context where there is a great deal of division and mutual suspicion. And also, purely from a practical perspective at the bedside, I prefer a relatively uncluttered rite where the central things are able to shine clearly, and I wonder if having to bless the oils would end up being kind of distracting at that point?
I've been told to return it to earth, also. (I've never seen an oil burning presence lamp, either).