those 2320 batteries and others are a few pennies each. Who knows, maybe the innovation is that they make a new biodegradable or greener battery even - too much metal in those coin cells anyway.
PIA to remove those batteries from the device as well - so maybe Apple has a better way?
I think it’ll just be like the AirPods. Not user serviceable because they don’t want “dumb” users, and there are some, complaining that their battery fell out etc