Nikon and Canon and all the other camera companies, Japanese, German, or otherwise, are not software companies and have a pretty awful track record for even the basic software in their camera interfaces. Post processing is something they could not or would not get involved in.

Apple ate their lunches and then some. While I'm an old-school photographer who thinks a great SLR camera is the photographic equivalent of driving a Porsche, I don't miss carrying pounds of gear around. (OTOH I HATE the Ux of iPhones for photography.) I digress. The camera biz is a classic biz school study in humans being human.