I think this would be awesome if they used the same aspect ratio paper does, 1 to 1.414, so you could open the phone and have a phone in the same aspect ratio but larger. You know, if we're going to keep having nonsense screen aspect ratios where you can't watch any videos without black bars or zoom, you might as well do something fun with it.

Edit: it's also really stupid that we've seen phones go from being folding, to smartphones, to slowly getting larger and taller over the years, to the point where now people are jonesing for this simply so they can have a more compact phone again. I doubt for most usage you're going to use the inner screen at all, there's pretty limited potential there in what you're watching and doing. Watching a video is probably gonna hit you with omega black bars. Only way I see this making any sense is if you have a classic square to real phone clamshell design, GBA style rather than DS style, but that still doesn't make that much sense to me.