The concept of a folding screen device is so full of complications, many of which just don’t have a solution (now and likely not in the future). Durability is of course a big issue, and it’s not just the screen that is compromised. The hinge mechanism needs to be complicated, because it has to deal with allowing the screen to move, and like anything complicated, there are far more potential points of failure.
Another issue, that just doesn’t seem to be talked about, is water resistance. Here we’ve gotten to the point where most devices are not just water resistant, but can be submerged without damage, yet these folding devices can’t handle any moisture, let alone dust or lint, without compromising the device.
Power is another big issue, and related to that is the required additional thickness that creates a really thick, and in some cases non-pocketable, device. Having a double sized screen, which now also includes a third screen on the reverse side, requires a lot of battery.
Then you get to the screen and this paper-thin glass covering. It would be one thing if the screen and glass could simply fold and unfold like a piece of paper, but because of how both the OLED panel and the glass need to have some radius to the fold, it means the screen needs to move within the folding device to account for the differences in radius from inside the screen to the outside of the glass. And because of that, you don’t get a rigid panel like you do on a typical slab device, which just adds to the potential for damage.
What I’m not understanding most of all about folding phones in their current iterations, is why do we need a device that you have to open up to get a mini-tablet sized screen? Is it for productivity? Or maybe it’s for those people who have eye issues and require a larger screen? Or is it really just a consumption device for watching videos or playing games?
I’m not saying that companies shouldn’t be trying to figure things out with folding devices, but no one is currently selling the features / advantages and benefits of a folding phone, likely because there are too many negatives to overcome.