My own thought:
Smart watch is just an extension or compliment to smartphone. Smartphone works perfectly fine without smart watch.
In early time of owning the Samsung Galaxy Gear Fit, it is fun to view notification on the watch, change watch face, heart rate sensor, change wall paper, connect some apps, pedometer. The watch will vibrate when notification is being pushed, or when a call is incoming.
I still prefer to view all the notification on the smartphone, where I can reply (Gear Fit cannot reply message), still prefer the bigger screen on smartphone.
Now, I used the Gear Fit as a digital watch only.
It is still a gadget watch, look much unique and expensive than conventional watch, but cost much less (actually quite affordable) than the branded mechanical watch.
That's why need 'proper' smartwatch aka Android Wear. Reply to message via voice, quick search, Gmap navigation etc.