What I like about platforms like this is the possibilities they open up for major players to experiment with weird form factors again. Basically the cost of software development, mostly.

I loved some of the insane designs prior to manufacturers deciding that the iPhone form factor was the way forward.

That said, Moto/Google did try something like this once, "Project Ara" which never really went much of anywhere. It led to a few modules being released for the Moto G and that was it. (IIRC)