I've been reading the forum for years and I had to made an account just to respond to this post.
I really don't understand so many skeptical people. I understand that more than one person may not like the idea of a ring and prefer the watch, but clearly there is a market for the ring (oura, ultrahuman, samsung galaxy...). There are people who simply don't like smartwatches, or prefer traditional watches. I, for example, like the ability to track my health, but I prefer a traditional watch.
I also don't understand why they say that this product would cannibalize sales of the watch. First, because if it does, it means that the product is sold, therefore there is a market. Second, because I don't see that they use that same reasoning for iPads, airpods, macs. Does the Mac mini cannibalize imac sales? Do normal airpods cannibalize sales of airpods pro? Did the iPod nano cannibalize the sales of the iPod touch?
And finally, I read somewhere that why have a ring when you can get better data on your wrist. This is false, better measurements are obtained by taking them from the finger. When you go to the doctor they take your oxygen and heart rate from a finger, not from your wrist. Not to mention the comfort of sleeping with a ring vs. a watch.
If you're interested in tracking your health, a ring makes a lot more sense than a watch. If you want a cell phone extension, the watch makes more sense.