I can only think of two justifications for a two-screen phone/tablet like device:
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Permanent virtual keyboard space. where the second screen is just always the keyboard / emojis/ control input device. This way the app size doesn’t get scrunched down when the keyboard comes up.
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If the point was to be able to carry a larger display than would be possible - say, having a standard iPad that folded in half so you could stick it in your pocket. Having a minimal bezel (say a 1/8 inch or so) might be better than having a “folding screen” from a mechanical perspective, since you could still have a glass screen top. Obviously, hinge design would be a thing. This would want to look like a single display when deployed.
I agree with you that having two apps up on a cell phone or tablet right now seems a little pointless under most conditions. I mean, having an app that you are using for content creation and having an app that you are using for reference might be useful, but that is a very small use case for most people.
