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).
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
Multitasking would be huge. One reason I hate doing anything "real" on my phone is because I can't see more than one thing at a time.
You get more to see.
Maps are too narrow on phones.
Books also are easier to read.