I think articles like this one show a lack of imagination. When I think about folded stuff in my life, I immediately think of a newspaper or a road map. I'd love a display that I can fold an arbitrary number of times to get the size that makes sense for what I'm looking at and where I am.
I'm not saying "aspect ratios don't work, therefore the whole thing's a bust", just that we should expect that one or other of the devices will be quite a bit different from what we normally see.
The Lenovo Yoga Book is quite different in the sense that the multi-screens are never really viewed as a single form. One screen is more of an input device, while the other is what we would usually see as a screen. I'm not saying that the foldable phone can't do this, just that it's very different from a "phone that folds out to have a bigger screen for watching media" device that I've seen people expect these foldable phones to be.
I think articles like this one show a lack of imagination. When I think about folded stuff in my life, I immediately think of a newspaper or a road map. I'd love a display that I can fold an arbitrary number of times to get the size that makes sense for what I'm looking at and where I am.