i think the idea is to make the os extend across screens much as you do on a desktop 2 screen setup not have individual screens. you could do it by making the 2 screens have no bezel on the side they meet and then making a clever hinge that brings those screens within 1mm of touching when unfolded
People complain about a notch on an almost invisible place on their screens, having any kind of line running between two screens is very likely a no-no for designers.
I never read documents across my multiscreen desktop display though; so I cannot imagine doing so on mobile. Consequently, I wouldn’t want apps or webpages spanning both screens unless they were specifically designed to.
