I agree that is isn’t really necessary for mot people, but I do know quite a few people who use it because they know they know the phone will be safe. My partner uses her phone in the pool all the time. I’m often dripping wet after coming in from surfing, even after drying off with a towel. It is nice to be able to check my phone without worrying I’m going to mess it up.

I’m not saying it is a feature every phone needs, but it is something that some people use. I’m all for replaceable batteries and would like to see them more available. They will improve the longevity of devices as long as they aren’t damaged in other ways.