Earlier quoted context omitted.
Absolutely nuts that this thing wouldn't be engineered so that at least a swelling battery causes the exterior to split so that the swelling is directed out rather than in.
It is understandable in some narrow sense because you want the outer surface to be nick-resistant, so you need to make it out of reasonably thick metal. Plastic rings would look terrible after a couple of weeks. But it's really hard to justify the big picture. It's hundreds of bucks + a monthly subscription for... what, exactly? Why does this need to exist? If you really want to gamify your pulse and sleep patterns f…
Once upon a time I thought this kind of thing would be needed for accurate hand tracking for VR applications, in lieu of a full glove, but it seems to not be a major use case.