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Biometrics, heart rate and sleep tracking are huge, like 95% of the reason I own a smart watch. It's a sensor, not a UI. Everything else can be done better on a phone.

I turn off notifications (because if I get a message on my watch, what am I going to do with it? watch is basically read-only)

One use that comes up a lot: setting a timer. Being able to ad hoc set timers with your voice is huge - without it, my coffee would get cold, my laundry would stay wet, and my kid would be late because dad got distracted by a HN comment.

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