I think this discussion is missing the point for the dx mode. It is an option for sports, wildlife, perhaps some event work where speed and image size trump mega bites and post processing. Going back to at least the D2x (2.0 crop)it has been available. The D3 and D3s also offered 1.2 and 4x5 modes. Just another tool for the photographer. Think news service that want small jpegs not jumbo files that some magazines desire.