I didn't realise my belief had to be novel in order to be valid. Or is it only when you associate my belief with the boogeyman of Foucault?

> you also assume there is one form of expression per "group"

I didn't assume that or imply it in any way. I understand that there various linguistic strata and they each have their own substrata. I still stand by the assertions I made above, as while there are inter-group power dynamics at play in the defining of "brow level" there are of course also intra-group power dynamics.