For me at least the screen size isn’t the limiting factor the lack of a keyboard is. I don’t know why I’d choose this device over a Neo or Air + non-folding phone.
This, for instance, combines a battery and compact physical kb https://www.clicks.tech/products/powerkeyboard
We know Apple is bringing a folding iPhone through manufacturing leaks. A desktop mode is less likely to be leaked, since it would be mostly software and (a lot) less reliant on third parties.
This needs to come to ALL iPhones. You plug in a usb c cable to your monitor and bang, iPad Neo.
But Apple being Apple will software block it...
> A third discovery was arguably more specific: a new system key that returns the total count of *built-in* displays on a device
(emphasis added)