Well, of course you are free to start a thread in say the camera section -- there are active Nikon and Leica threads going there now. So if you have a body to talk about, that seems to be an OK place to do it even if it is non-Canon and the section is designated "EOS" or another Canon designation.
The same goes for lenses -- all manner of lenses are discussed in a lot of threads in the Lens discussion section and the Lens Archives section.
So, it's not like you aren't free to post in a topic-appropriate section. But, yeah, the overall purpose of the forum has been for Canon users, just like there are forums for Nikon, Pentax, etc, and then there are forums that are specifically about general photography with no ID relating to a certain make, so what do ya do? I like this place for what it is, but then I'm quite happy with my Canon DSLRs and having a place where they and I can call "home"
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Another consideration: if their were non-Canon sections for bodies and gear, well, fine, people with that gear could post there, the threads about Nikon and Leica bodies and non-Canon lenses could all be moved there, us Canon shooters could easily just ignore those sections and stick with our Canon sections...well, as nifty as that might sound, it also means that we would lose the exposure we have had over the years -- we Canon shooters can gain with having some exposure to these other lines, and vice versa, and since discussion here is pretty open as far as, say, Nikon shooters being able to talk about there bodies and features (as long as they don't get obnoxious about it) well, we Canon shooters end up with some nice info. And the same goes in the other direction -- there are Nikon shooters who hang out here because of the quality of the help and info that comes out here. I'd personally not like to see the "other makes" "segregated"!