It is not that long ago that smartphones would die from moisture exposure if you left them in the bathroom while taking a shower. I had a girlfriend around 2001 who spent all her savings on a shiny new Nokia 8250, got drunk and barfed on her jacket. The phone was in the pocket, and the moisture from the wet jacket completely killed it, she cried about it for weeks. I also remember my mother dropping her iPhone 6 in the harbor while getting off a boat, it got picked up but was dead. Last year I was out hiking in the rain, and my aging (5+ years old) iPhone 11 got water inside it and started dying soon after (I'd been sailing/swimming with the phone and had exposed it to salt water, apparently that will wear down the seals if you do it enough.)

In other words, I absolutely see the need for waterproof phones, even for ordinary people doing ordinary things, and am never going to buy one that isn't.