Rede, I appreciate what you are saying, but I was under the impression that science, as far as possible, dealt in precision. We all know that when we say a glass has nothing in it, we don't really mean nothing; simply none of the things one might expect to find in a full glass.
The idea of spacetime with nothing in it is only a little less imprecise if we accept that it is a mass of virtual particles, all doing their thing.
I'm not sure that I accept dimensions alone as constituting "something". Like numbers, which I believe have no existence of their own, dimensions are concepts which we impose upon space for our own purposes.
I accept that it is sometimes convenient to use "nothing" in an imprecise way, but there has to be a danger that without care it can lead to the same sort of confusion of thought as failing to make a distinction between mathematical and physical infinities.
