As we know smartphones change constantly. Couple of months you will be getting a new version OS. A year or two you will be getting a brand new phone hardware. Even Bluetooth is moving from version 4 to 5, probably in not so distant future v6! A smart watch with a display and functions completely relied on the phone would become a paper weight, when it's no longer compatible. That wouldn't take long at all.
Casio kind of taken a middle approach, adding Smartphone Link or Connected Engine (whatever their marketing terms) to a traditional looking digital or analog watch. While these can function on their own as a regular watch, they do lose half of their functions when they fall behind to technology. I read couple of manuals for these watches, I noticed they put the instructions for setting the watch with smartphone first, then instructions for manual setup with buttons next. So that's how important they see the connected functionality. But the 1st half of that manual will be useless when the watch can no longer operate with a smartphone. You would have to turn to the last half of the manual for the less friendly buttons operations.
So do you think these watches will lose their values faster than regular watches? Or would they still retain their values due to their physical aesthetics alone, even when they can no longer be connected?