I know.
My point is if you're going to export your mix from cubase then open it in, say, Wavelab - then you limit the mix and or compress it with out normalising to -1dB, aren't you just limiting and compressing the noise of the mix. I realise volume and gain are not the same thing, of course.
The reason I ask is because I'm not actually sure why I normalise mixes. I was just taught that way.