As a mathematician I've long wanted to figure out the code to match up several photographs for a 3D model of an open book, to correctly flatten out the image of each page. Bonus points to use AI to clean up the image, or convert to source that faithfully represents the page layout.
There are apps that take one photo and then guess how to correct the distortion. They don't do as good a job as one could do with the actual 3D data.
Many of us don't want to dedicate the space or money for a professional book scanner, and can't find an affordable flatbed scanner that scans all the way to one edge to better support books. I'll sometimes slice a second used copy of a cookbook, to scan every page using a sheetfed scanner. Grabbing one's phone should win ease-of-use over any other solution, if it could match the quality of these other approaches. 3D cameras would help that.