The current halfs are basically just for giving the phone different physical look/colour and for installing the ambience related to that OH. In other words: overglorifield alternative covers.

I don't really see that as a weakness, or at least an unexpected weakness. They'll need to sell tons of more units before any commercial operator would begin to make other halfs that would truly take advantage of the possibilities offered by the concept.

But yeah, as you say, 3D printers have lots of options. I would be happy just by having a camera tripod OH that would be dumb (dumb = no fancy data connection).