I think no company has yet figured out how to make affordable waterproof phones that are also user serviceable. The moment you open your phone, you destroy the adhesives and say goodbye to IPS6. Watch makers have solved this problem long ago, is it just not scalable for bigger devices?
Gaskets are hardly a new technology. And even if that is not sufficient, there are silicon glues that you can just apply like caulk, then put the parts together and wipe of the excess with a bit of IPA. But then I guess you still have visible creases and screws, so it won't look so good. (Source: working at a company that makes IP65 touch devices for industrial uses).
