Earlier quoted context omitted.
IDK about Coros or Suunto, but the only Garmins with a battery life approaching 30 days cost ~$1,000. This could be competition for AWU, but wouldn't communicate that there is demand for a more basic/long-lasting Apple Watch.
30 days is asking a lot of any reasonably sized smartwatch, but if you set your sights a bit lower then a $250 Coros Pace 4 will do ~3 weeks with AOD off, ~1 week with AOD on, and 30-40 hours of continuous GPS recording. That's still a lot longer than any Apple Watch even if it's not hitting the 30 day milestone.
In thinking further, I realized that the buttons are actually a pretty good moat against the big tech company competitors. Their UIs are all about touchscreens, so they'll never have as many/useful buttons as Pebbles do.