I wear a watch everyday.
* My gf doesn't like it when I'm always checking my phone. Actually, it's pretty rude when you're having a conversatin with someone to check your phone. It can also be rude to check your watch, but usually it's much better manners.
* My conference rooms don't have clocks either. I work at the largest corporate campus of one of the largest banks in the world. Some people do put their blackberries on the table. That's fine. I like my watch.
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I realize that not everyone sails or cooks or gives a flying fuck if they are rude to someone they are talking to. If you find that a watch has no practical utility for you, good, don't wear one, and don't post in fucking threads about watches.
I wear a watch for the reasons you cited above, and others.
My cell phone is off and in my car. It is on only when I need to make a call or am expecting one; nobody has my number and I want to keep it that way. Too distracting. It is far more convenient to glance at my wrist rather then dig in my pocket for a phone (which may be dead), read it, and put it back. Also, some of my pants/shorts don't have pockets, and I don't feel like carrying a cell phone which may get lost or stolen.
With clocks everywhere, I am kind of amazed that people are unaware of them, and make the efforts to dig out their phones to tell time.
I see people bring their phones by pools, on boats, docks, etc. and have seen my share of disasters. Nothing beats a waterproof watch for places like these.
Also, I do like the look of a watch. Some of the never-used features (e.g., tachymeter, extra dials) to me are cluttery and distract too much, but I know some people who enjoy the detail. I prefer clean looks with muted colors and bracelet bands. They last much longer than any smart phone will.