I felt like you as well: I like to track sleep and my heart rate during sports and with the pixel watch it felt like I had to almost plan these events (and more annoyingly while travelling) around the charge state of my watch, until I realized I had two separate requirements: notifications (which I don't care about during sports or sleeping), and fitness tracking.

Unfortunately the solution ended up being paying google more money and getting a Fitbit air (which I can use for sleep tracking for an entire week-long trip without bringing a charger)

And only wear the pixel watch for my awake hours, which a 30 hour battery life is more than enough for, even if I forget to charge it for a night or two.

Another bonus is the Fitbit air is a lot more comfortable to sleep in, but of course I no longer care about the charge of my devices.

I love how light and comfortable the fitbit air is, but I find that the data quality blows. Both steps and sleep (pretty much the only two things it can really track) are not super accurate when comparing to other devices. Hopefully they can sort it out with software updates