I miss when the Galaxy Watch ran Tizen instead of Android. I still have the original Galaxy Watch and the battery life is just unbeatable. Likely because it's not constantly phoning home about the most benign metrics.
Mostly heart rate tracking and scheduling reminders so I don't forget things. Also good for step tracking and stuff, realistically I'll just get a Garmin next time cause I still want the long battery life and that's not really a thing with Android based smart watches.
Wear OS is pitiable. My previous GW 4 40mm had 247 mAh battery and barely lasted a day with AOD on. Plus the charging was so slow. Even with Samsung's latest Galaxy Watch Ultra, it has lesser endurance that what Tizen based Frontier had.