To me, hand washing is not working very well. For one thing, it doesn’t always start. But more annoyingly, it seems to not count down consistently. Every second seems to take several seconds to count, and often it’s just stuck. I would say I have to wash hands for a minute for it to count 20 seconds.
I think it’s because of a paternalistic attitude from Apple. The simple implementation would be that when the watch detects hand washing, it starts a 20 second timer. Instead, from the description on Apple’s website, it seems to really want to check continuous hand washing. What’s the point? Only so that Apple can say: “you’re bad, you did not wash your hands for 20 seconds.” I don’t need that. I just need a 20 second timer that starts automatically.