What if the phones themselves wouldn't have a screen that big, but a concave glass that would expand the display to look as big as the phone while there is a small micro LED display powering it up beneath. At that point, these touch less gestures would be needed because even when you do touch the screen, it wouldn't mean touch-screen the way it means today.
Think about it. Too futuristic... I know. I've always fantasized the phone to be a simple glass brick that is almost see through. I know that's impossible. But given how expensive MicroLED they claim to be, may be this way they could get it to work on phones with a smaller footprint of the actual display panel and use curved glass display to create an illusion of a full screen display.
An early in the day Tech Fiction