Since 79% of smartphone users use a case, how is this supposed to work out?

It seems to be me your two options with a mobile device are:

1) Make it durable so that it can be dropped on a variety of surfaces without big concerns of dropping or scratching. This might be a lot easier to achieve if devices got much lighter (or go the Toughbook route and harden it).

2) Allow it to support a variety of case types that a user can choose

This whole thing seems more like a prototype than a great idea. I think foldable and rollable computing devices have a future, but this doesn't seem fully considered.

Although this one looks significantly better than the Galaxy Fold, which reminds me of the Homer Simpson Car: https://patrickwthornton.com/samsung-galaxy-fold-is-the-home...