"My Watch saved my life back at the end of May, by notifying me of a very elevated heart rate, and stating that I should seek immediate medical attention. I went to the emergency room, and ended up in the hospital for 2.5 weeks. If it weren’t for that, I could be dead. So is this trivial? No, it’s not. It’s worth every penny. Your smartphone can’t do that."
So they save lives?
Arguably, a cheap plastic band around everyone in the world's arm that said "Don't smoke, and don't drive drunk" would save more lives by a bajillion percent. Your needs are not the needs of the market, when talking about absolute mass-market products, rather than niche ones.
(I would of course have the geek version--a mobius strip.)