https://www.cnet.com/news/why-the-galaxy-note-10-could-get-a-slide-up-swivel-camera-like-the-galaxy-a80/

It's been years since phones that swivel, flip and otherwise move have been en vogue, but all that's changing. Foldable phones like Samsung's Galaxy Fold and Huawei's Mate X are both raising and reflecting an interest in movable design. Cameras, too, are becoming more mechanized to rise out of the belly of the beast in various ways.

Both sliding camera and foldable trends serve the demand for ultimately giving you more screen to work with. In the case of a slide-up camera, that's to solve the problem of sensors crowding the screen. If the "notch" didn't win many fans, maybe a slider camera array will.