I use RAW as well, being a photographer I also have Photoshop and Lightroom to edit the files however most people don't.
I've taken RAW images indoors on my 6s Plus and 7 Plus and there is not much separating them, the noise on the RAW files needs really aggressive noise reduction that smooths out the photo totally, loosing a lot of detail.
Point is people aren't always able to take photos in good light, my pictures taken indoors on a sunny day look poor. I want my iPhone to take keep sakes that I can print, so my SLR isn't always in tow. I'm not expecting SLR level of quality at all but something useable at least printed up to full size.
On the 7 Plus the telephoto lens is really not useful unless you're outdoors in sunlight as more often than not iOS uses to digital zoom rather than use the telephoto lens. I understand why this is but do feel a little cheated that this lens performs so poorly in anything but daylight conditions.