Bit of thread resurrection here, partly to admit my own stupidity! Contrary to my declaration in the OP, in February 2023 I bought a new Fitbit Versa 3 to replace the Charge 3 which died in under 2 years. So here we are with a watch that cost £170 just over 2 years ago, and it is also landfill. The battery suddenly went from using about 15% capacity per 24 hours, to totally discharging in about 12 hours. Quickly followed by overheating badly when charging. From some online research, it appears my cardinal sin may have been to change the clock face to one that I downloaded ...... from the FitBit app!!
So this time, I will NOT be buying another FitBit/Google product. Whether I bother to replace it at all, I am not sure. i might revert to one of those old fashioned things on my wrist that give useful information; like the time. Maybe even the day and date. I have lost interest in knowing how many steps I have done in a day.