You missed HealthKit. HealthKit is something that solves a real problem. Having all your health data stored in one place, that's something that makes sense.

Apple Watch is Not a health device and I fall short of imagination seeing it as a health device. The first attempt? If they really wanted to create a health device, they would have certainly done so, it's not like they don't have the resources. If they really wanted to create a health device they would have created a device which measures blood pressure, body temperature, does blood count tests, etc. Not a watch that counts steps and sends taps and heartbeats.