Although Apple's flagships are now water-resistant, the Cupertino-based company is apparently working on a next-gen display that actually works underwater. This could mean that the iPhone XI will feature a touchscreen that remains perfectly usable while submerged instead of just following the foldable trend.
https://www.notebookcheck.net/Apple-s-iPhone-XI-rumored-to-feature-a-display-optimized-for-underwater-operation.413729.0.html