They're clearly optimizing for a single waking-day of battery life, which is (imo) a reasonable thing to aim for. I don't want to wear a watch when I'm sleeping

They're clearly optimizing for a single waking-day of battery life, which is (imo) a reasonable thing to aim for. I don't want to wear a watch when I'm sleeping anyway. It's a different tradeoff than Pebble that allows them to do more. It's also something they've worked hard to pack features into (e.g. Siri voice on-watch in series 3)