Oh, my point there was not that it is not possible. It should even be possible with an XLST stylesheet, though last I looked that was buggy. I wanted to express that you can't make RSS accessible to users if users have to install extensions to get a proper representation (and feedreader selection) when opening a feed. This stuff has to be built in to make RSS usable for the general public.
I completely agree that this makes RSS less accessible. So really it depends on whether you see RSS as a core web technology, like HTML or JS. It's pretty clear that Mozilla do not, nor do Google. Personally I don't either, although I'll admit bias because I really seldom use it other than through automated means.
