Apple hasn't "invented" most things, from the personal computer, MP3 Player, or smart phone. They tend to revolutionize the things by making them work extremely well.

Hey, if they can get the hinge working better it might improve the category at least. You'd expect Apple to do well at manufacturing for that kinda stuff

Current foldables are fragile, require a built-in plastic screen protector, and have a visible crease. Apple is very unlikely to be willing to accept those compromises. We'll see, but I think their entry into the field will change things.

"hey guys remember that screen technology that came out seven years ago and has had plenty of time to mature? Well our 65 year old CEO just discovered it and has found a way to make it stratospherically more expensive than its ever been before!"