Because it goes with you, it’s a personal device. None of the devices you list, except the cell phone, go with you.
Plenty of people do not wear a watch, but many still do and will continue too.
jw
But if there's a clock wherever you go, why take a watch with you wherever you go? I do see the perceived need for a wristwatch. It's a comfort thing. People are free to do as they please (for now). I'm only saying that I have been watch-less for ten years and have not missed one. And my father-in-law is a Watchmaker.