I've been testing shooting in raw with my iPhone 7 for a couple of days in different conditions from low light to fairly strong daylight and faced two consistent issues: the amount of noise produced, even with very low iso (<100) is unacceptable. This needs a fix pretty fast, I'd say. The photos taken with the stock camera app are much sharper with hardly any noticeable noise in daylight at all. When shoot in a shady forest yesterday afternoon I realized that the camera app in Lightroom mobile shot with a shutter speed of 1/35sec, thus all pics were shaky. Again, the stock app shot much faster resulting in steady and crystal clear and sharp images. As of now the raw option is of little use due to these limitations, unfortunately.