The Apple Vision Pro was a rare early entry into a field. Usually they wait until the technology is established and the userbase is just starting to take off, as is currently the case with folding phone displays.

Samsung has already worked out the major kinks for folding displays, over dozens of products used by multiple phone manufacturers including themselves, and Android has worked out how to handle the various use cases between the outer screen and inner screen, when closed, open, or partially open, so Apple can pull from the current state of the art and launch with a more fully developed product, as they usually did before the Apple Vision Pro.