I have never used a case and never will (just don’t like the bulk they add). I do use an edge-to-edge screen protector on my XS max and keep the phone face down so the camera lenses don’t get scratched or smudged.
Been using iPhone since the 3G (X since release), have yet to smash one and have never used a case. Don't think day will ever come because cases suck and not dropping your phone isn't exactly rocket science.