watchOS 27 drops legacy Apple Watches in favor of newer hardware
Apple announced watchOS 27 at WWDC with a fall rollout, but many older Watches (including the original Watch Ultra) won’t receive the update and will only get security updates; new features like Siri AI and heightened gestures require newer hardware (Series 9, Ultra 2, SE 3), so owners of older models may want to upgrade for the best experience.