>Under/over within the 10 stop range is understood. It is not clear to me how that has any benefit outside the range.<
I don't quite follow what you mean. Please can you clarify?
My original comment was simply alluding to the fact that the greater the DR of the camera, the less likely will be overexposure or underexposure of an image I capture, all else equal, and that with a D800 I have captured images that even with careful exposure were barely prevented from being both.
>The SNR argument is one I hadn't thought of and that might be the king pin?<
No idea. The thought occurred to me as I wrote the post.