yeah all very true and you are right of course, dont you get that feeling though that people who are into cameras and photography look down on the 6d a bit? it doenst bother me but i get a that feeling a little, for some reason everyone loves the 7 series, or at least accept it.
There's something to what you say, and there's a historical basis. Previously, there were only two FF cameras - the 1DsIII and the 5DII. There wasn't really an 'entry level' per se, but everyone knew the 5DII was 'gimped' relative to the 1DsIII in every way but IQ, particularly in the AF department. Now, we have three current FF bodies, and the 6D is really closer to the 5DII in performance - AF is ok, but far short of the 5DIII. But 3 levels of product allows a conceptual separation and gives us an 'entry-level' in the category. The APS-C camera market has more levels, and the 7D is at the top of the heap.
Really, it's all about horses for courses. The 6D is a great camera that delivers top IQ for landscapes, portraits, basically things that don't move fast. The 7D is a great camera that delivers good IQ in decent light with static and fast-moving subjects. The 5DIII combines the performance of the 7D with the IQ of the 6D, making it a truly great all-around camera.