Getting stuff 'in' to iOS has always been an issue. it's the one factor which pushes people towards a laptop or a competitor.
With the Adobe stuff - in particular Lightroom Mobile, you upload the files using Lightroom on your main computer, and then the 'smart previews' appear on your iOS device.
Obviously you still need to use a PC or Mac to 'ingest' the images. However the reason this is the way it is - is so that the PC/Mac does all the heavy lifting and outputting of RAW files. The system is very good to use, but it doesn't help when you want to pop RAW files into the iPad on location.
This is the absolute killer thing for me - the one thing which pushes me to thinking about a MS Surface for on-the-go editing.
They tell us we can edit 4k video on the iPad Pro - but how the devil would you get it into the device?
For me, the ingest in the absolute missing link. HOWEVER the new Adobe apps, and LR mobile along with a dedicated touch system (rather than Windows on a tablet) does make the IPP much more compelling.