My Watch 4 is two years old, and it has gone from needing one charge a day during the first year, to two charges per day in the 2nd year, and now as year 3 approaches, it needs to be charged 3 times a day. This is annoying beyond my tolerance. Big apple fan, but I will not be purchasing a new Apple Watch until: 1. They strip out some of the unnecessary apps and routines and/or 2. Make it about as big as my iPad Pro so that the battery can be bigger. (Joke).
The basic problem is asking too much of a postage stamp-sized battery. I worried about this when I laid out $700+, which has worked out to about $1 a day. Nope, there is a Garmin out there that costs about $150 and lasts a week on a charge. Bye, bye, Apple Watch.