I don't see a gap in camera-processing for either phones or DSLRs, because the experience sucks on both. But you are right there is a gap between "consumer" software and "pro" software that could be addressed.

I don't know if offloading a bit of processing to your phone from a camera would fix much really. Ergonomics of cameras is much better for taking photos, and there isn't much in there you don't need.

I guess you could get rid of the screen entirely, and some of the user controls. That could be nice but would be difficult from a product point of view, as you would be dependent on the whims of a larger market. See all the difficulties getting standardized on things for car, where there is much more incentive...