Since having to use a phone to scan for a couple of weeks (since I lost my reader), I can now totally understand why this is such an attractive prospect. The reader is so quick and easy to use and small and comfortable to handle that it never seemed troublesome to scan and I wondered why people really wanted this full CGM option. After two weeks of having to open the phone and then open the app and wait whilst it buffers before I can scan and then wait for a result.... I now "get it". The touch screen seems to be less responsive too and I am incredibly frustrated by it and cannot understand why anyone would choose this system over a reader, so can now definitely see the value in having at least one step of the process removed.
Admittedly I am also having to cope with the frustration of getting used to a new phone (an iphone from using an android for many, many years and hating that as well), so I know that I am likely not judging the situation impartially but really not impressed with using a phone and pretty sure I will be going back to the reader, even once full CGM is working on the phone. I think the reader's functionality could be improved but on the whole the very small benefits of the phone app in no way counteract the awkwardness of using it. Maybe if I was more tech savvy and used one of the unofficial apps it would work better for me but I am not sold on the Libre app or the iphone for that matter.