I'm not arguing against this, to an extent I agree. But I don't think it's fair that the person with an 89% health battery can replace it just so he can bump the price up on his listing when he goes to sell it the next week.
Speed, for one. Replacing the watch with a refurb takes a day or two, while opening watches and replacing components takes a lot longer.
I could see Apple having a refurb team trained to work on these watches with specialized equipment. They're annoying to work with, sure, but I've replaced screens myself in just an hour or two with no tools and 5 minutes of looking up how, so it can for sure be done professionally. With how limited run some watch units were, most notably the 18k gold Edition models of which only 20,000 exist, the option to replace them with new ones simply isn't there.
Yes. See my first quote reply in this message. There needs to be a defined line between what Apple determines needs replacing and what doesn't. That line has to be drawn somewhere, specifically to avoid people getting a replacement just because they want a new watch. Generally, not always, but generally, batteries will act fine up until the 80%ish mark. Apple acknowledges that and will replace it under the mark they deem fitting. Anything above that usually lasts fine. Again, not always, but for most people, that will be fine.