Personally, I don't see the attraction of a foldable phone.
I'd rather see Apple innovate on iPhones with dual LCDs -- a full screen on the front, and another full screen on the back. You could actually do away with the notch completely with such a phone -- at least on one side -- and would eliminate the need to even have a selfie camera. You simply move all the cameras and sensors to one side.
I love the idea to have an a bit screen on the front and a lesser one on the back so there's space for the camera, flash, phone speaker, etc. Being able to unfold them for dual-screen use would be great, but I don't trust apple with hinges anymore. On the Macbook pro they're using a ribbon cable that rubs against a sharp edge every time you unfold... that's just wrong.