Raw normally unless I'm traveling. Then one card Raw and second slot jpeg because it loads so much faster on the iPad and allows me to backup photos. Save the Raw card until returning home.
The Apple ecosystem is built for RAW.
My travel workflow is similar on my 5DIII, except the RAW backs up the JPG, not the other way round.
Not really. The Apple ecosystem, as far as photos are concerned, is to make photos from the iPhone look good.
This is clearly a value judgement, not a technical assessment. The OS recognizes RAW, and opens the file using the appropriate RAW profile. If you use Finder, Photos, iPhoto, Image Capture, Preview, or Aperture, they display a converted RAW and/or allow you to edit from the RAW file.
You may not like that you have no control over this behavior (substituting your own, customized RAW profile, let's say). You may prefer working with more sophisticated image editing tools (which is your privilege), but if Apple's only purpose was to support iPhone photography, it would need none of this.