Comment by Arubis
At the risk of sounding like a shill, you can get by on the Apple Watch ecosystem’s battery life. The charge time is really quick, so throwing it on the charger while showering each day is sufficient.
Your point that a 36 hour battery life on a watch is pretty inconvenient stands. I have an Ultra 2 almost entirely because it can be described as an Apple Watch with a slightly more reasonable battery life. That’s a price I don’t expect most folks to pay.
The 36 hour battery life also isn't a best-case scenario. According to apple.com
"All-day battery life is based on the following use: 90 time checks, 90 notifications, 45 minutes of app use, and a 60-minute workout with music playback from Apple Watch via Bluetooth, over the course of 18 hours;"