Daily charging for normal use isn't so much an issue once it becomes a habit, but battery life during extremely long (24+ hour) activities is pretty much a make-or-break feature for me.

I've done some 50ks and while truthfully I may never do an ultra that requires that much battery life, choosing a device that can't almost feels like admitting defeat. It's kind of stupid but I know I'm not alone in that thought process.

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.

The problem is that 30 hours slowly becomes far less over time with software bloat and battery degradation. What I hated when I had a watch with a tiny batter like this is that if I wanted both sleep tracking AND the ability to track my morning workout, I absolutely had to remember to charge before bed. If I forgot, I'd wake up with a dead or almost dead watch and have to delay my workout.

I went though a number of android wear smart watches ~10 years ago and had the same problem with all of them. I absolutely loved my Garmin 945M. I had it for years with hardly any battery degradation and it typically gave me 70-80% of the advertised battery life for many years until it was accidentally physically destroyed (caught the watch on a heavy backpack I was taking off, which ripped off the watch pin anchor from the case).

The Fenix 6 I have now is not nearly so good. It advertises 2 weeks of battery and I'm at 53% after only 4 days or so. I blame this partially on their crappy iOS support where you cannot filter apps out, so every #$%#$%^ slack message I get buzzes my watch. I had a Pixel phone when I had the 945, where you can filter out garbage notifications. This is really Garmin's fault, since apparently Coros and Pebble can filter notifications on iOS. I'll switch to one of those when this Garmin dies unless they fix their iOS support.