Since this thread has morphed in something else, I'll add my two cents. Given my original post, I clearly have no qualms about cropping. Especially on the 6x6, where I like the freedom to compose vertically, horizontally or use the full square.
However, having shot lots of slides in the past and having used an SLR with 100% VF coverage, I do appreciate the self-imposed challenge of getting the shot right at the time of capture. Indeed, for a long time, framing and composition were my favorite aspects of taking photographs. Even now that I've switched to the less-precise framing of RF photography, I can see my SLR experience coming to bear.
It's surprising to me to read about a dogmatic approach to uncropped images on an RF forum. For me, part of the learning in switching to RFs was letting go of the desire to place compositional elements at the edge of the frame where I could not be sure they would make it to the negative.