Comment by leni536
21 hours ago
You are not answering the parent comment. If the original aspect ratio was a square, making the "full screen" aspect ratio 1:1, then folded out it would have aspect ratio 2:1, fitting two squares side by side.
The sqrt(2) aspect ratio allows a portrait full app to be scaled up to the exactly to the folded out screen. But does anyone want that? You probably want to fit more content on the bigger screen, so some layout necessarily changes.
It's still folding in half, so you can have have one app taking up the whole screen, or two half-screen apps, all with the same aspect ratio.