[nsriv]

It's one of those "limited consumer choices to ensure best experience" things. Using an SD card and it's slower I/O speeds would meaningfully degrade the video and burst capability, blackout free still shooting of the camera, so might as well enforce a higher standard tk ensure a uniform experience.

[retcon]

Heaven forefend that Nikon engineering chose the card format to match (exceed with headroom) the required transfer rate ;)