I'm sold enough on this form factor to take a flyer on a pre-order. I've been hunting for ways to minimize friction when quickly capturing random thoughts and this is a novel idea that seems to go further than anything else I've tried.
The lack of battery charging/replacement is a bummer, but slimness is far more critical for a ring than just about any other device so I understand the tradeoff. I've also seen stories of injuries from battery expansion in fitness rings, so if the risk of this is significantly reduced by eliminating charge cycles, I personally consider that a notable benefit.
Even though, IMO, there are enough legitimate benefits to warrant this product's trade-offs, I imagine its disposable nature will ultimately make it unsuccessful. Off the cuff, it's easy to look at this as "saying the quiet part out loud" vis-a-vis planned obsolescence, and I understand why many would find that extremely off-putting.
I don't understand why people who are probably OK with ordering Doordash once in a while are up in arms about a disposable device that weighs a couple of grams, lasts for years, and is recycled. You can easily spend more on a single Doordash meal for two people and I guarantee a few Doordash meals have more impact on the environment than this minuscule device ever could.