OK, so I guess I could see myself enjoying this design for some things.
For reading, it might give a rather pleasant feel in the hands, more like a real book but digital. And it does have OLED which is easy on the eyes. I adore the display quality on my 11 Pro but reading on a phone in portrait always feels like...reading on a phone.
For lazy times watching YT movies or streams while surfing the web, it would work well. I mean a split screen device would also do the trick but anyway. I guess my iPhone can't do split screen yet after all... But Android phones can.
For productivity, I often work on one document while viewing reference docs on the side. Nice to not have to juggle docs like on a single display phone. On iPad I can have them side by side of course, but this is a smaller category device so a different case. I could also dig being able to write text with the pen if the input field would appear on one screen leaving the doc unobstructed on the other screen.
Being able to flip it backwards so it becomes its own stand is actually very nice for watching vids. The YT vid above reminded me of that.
So I guess there are some situations where this thing would be rather handy. Where it gets weird though is that it doesn't seem like it'd do very well when folded up. No display on the outside, so it would never feel like a phone when in that mode. I guess you can fold it the other way with both screens out...? But that seems like really asking for trouble.
Haha I guess I'm getting more intrigued the more I think about it. But still, for what I could see myself doing with it, I wouldn't pay $1400. More like $500 for a tiny tablet, and then maybe a $150 premium on top for the convenience of having it fold up. Of course I know $650 isn't anywhere near realistic for a device like this, but honestly that's about what it'd be worth to me. It's something like an iPad Mini that folds up. Not a large phone that folds out to a small tablet, like the Fold.
And the real drag is that it'll never be a very nice format for when you want to watch a movie on as large a pocketable screen as possible. That's something the Fold does a million times better.
This thing seems to fall between a few different chairs. All in all, I would probably adore it if I got it as a gift. But I wouldn't buy it for myself.