from the article:
> Initially, we experimented by building this as an app on Pebble, since it has a mic and I’m always wearing one. But, I realized quickly that this was suboptimal - it required me to use my other hand to press the button to start recording (lift-to-wake gestures and wake-words are too unreliable). This was tough to use while bicycling or carrying stuff.
Pixel Watch have "raise to talk" to trigger Gemini, so you don't need your other hand.
Other watches detect gestures like pinching fingers on the hand wearing the watch.
I’ve never had that issue with my Apple Watch. Granted, apple are a world-class developer (arguably), so their stuff might be more reliable, but I use raise-to-speak and hey siri with my watch all the time.