I don't think I get foldable phones. When is the extra space necessary? I mean most of them turn from a somewhat 9:16 aspect ratio to 1:1. You don't earn anything in space to consume media content. The only real improvement might be for multitasking?
The foldable iPhone will have an aspect ratio very close to 3:2 for the outer display (like the original iPhone) and of 1.41:1 (between 3:2 and 4:3) for the inner display (similar to an iPad).
I mean you can see more at once but now your typing experience is worse. I have an iPad and it's by far my least productive device unless it's connected to a physical keyboard. Typing on a giant touchscreen is so much more tedious than my phone's screen.
It's not perfect, but there are plenty of things I do where I'm not typing very much, but I am swapping back and forth between apps or web pages quite a bit.
Running two full size apps at once is pretty nice. Text conversation and website, things like that. Or copying and pasting credentials out of a password manager