Adding this as a separate reply addressing some of the other comments here. Here is what I see to be the big use case for someone like me. Adapting your phone

Adding this as a separate reply addressing some of the other comments here. Here is what I see to be the big use case for someone like me. Adapting your phone on a daily basis. I have days where battery life is everything, so I put in more battery. Maybe I'm traveling so I swap in the high end camera. Maybe I'm out hiking and I want the compass or what-ever. Maybe I'm diabetic and I want a blood meter in my phone if I'm out all day. And I can do all of this without having multiple devices... just one I adapt to what I'll need that day. Repairs, etc. are the extra niceties.. but I see adaptability as the main feature.