Some commenters mentioned that the e-ink screen (and the accompanying battery life) was one reason why the Pebble is so beloved, which reminded me of the Basis Peak, which was primarily a health tracker watch with some (very limited) smart functionality (mostly just some notifications, if I recall), that also had an e-ink screen and a nearly 1 week battery life and had a sort of similar trajectory:

Bought by Intel, then killed two years later after a battery related recall issue.

It was, in my opinion, by far the best fitness tracker watch ever, and remains so to this day. Not so much because of it's actual features (which were relatively standard), but the software paradigm of simple yet effective exercise gamification that helped encourage exercise habit formation. 8 years later and I still miss it.