You can still get watches which use the same MIP display technology as the Pebble and run similar "smart-ish" software with very long battery life. They tend to be marketed more as fitness/sports watches rather than smartwatches though.
I love my transflective MIP Garmin Fenix watch, but it's not nearly as high-contrast as my wife's Kindle, which uses a reflective MIP e-paper display.
I would be an ideal candidate for a rePebble if I were not as happy as I am with my Garmin - though with their recent changes to inReach plans, crazy prices and lackluster features on the Fenix 8, and trend towards AMOLED displays (away from their roots, chasing the Apple watch market) they're not looking as amazing as they once did.
I think you're mixing up e-paper (generic term for non-emissive reflective displays) and e-ink (the trademark for a specific type of e-paper display). The Pebble used a MIP LCD, just like Coros and Garmins MIP models, it never had anything in common with the e-ink displays used on Kindles.
