As for complaining that Canon "hobbled the 6D"...if they did, it was not for fear of impacting sales of the 5D3. It was to ensure that the Nikon D600 could never be offered at a lower street price than the 6D ...
Hmm. Just consider the lower x-sync and max-shutter speeds on the 6D vs the 5DIII.
These do not lower cost in any way, as they are implemented in firmware.
Also consider the right-hand-only button placement on the back of the 6D.
Look for yourself [here]. The back of the camera is a self-contained, independent module.
Any technical person will tell you that the cost of this module will not be any different if it had
buttons on the left-hand side as well - like on the 50D, 7D, 5DIII, or the 1DX, for example.
Canon did not implement these particular 'features' to ensure that the 6D is cheaper than the D600.
You can be sure about that.