It looks like the new Google's Pixel 4 watch comes with yet another incompatible change in charging technology. This is a ridiculous situation. The original Pixel Watch used one type of wireless charging. Then the Pixel Watch 2 & 3 removed wireless charging and swapped to a different charging mechanism. And now the 4 has changed again. So three different charging cables in under three years.…
I also had all the Pebble, and technology has come a long way since.
The incoming Pebble revival uses the nRF52840 chip, which they estimate the battery life to around 30 days, from the usual 7 days.
I settled on something a bit more classic, I bought a Casio GBD-200 which has bluetooth connectivity, can display basic notifications and do some step counting. It works on a CR2032 battery that lasts about 2 years, no recharge needed.