Yeah. The way I think of this is, let's start from (my subjective) aesthetic first principles. Take an abstract human body, and look at its poses and movements:

Yeah. The way I think of this is, let's start from (my subjective) aesthetic first principles. Take an abstract human body, and look at its poses and movements: standing, sitting (and other forms of resting), walking, running. A smartphone is a complete failure from that perspective: looking down and pecking at a screen? No way. Now, holding and looking at something is a natural enough movement, but chronically craning your neck down with such focus and duration? I doubt it. A smartwatch is a bit more natural, but to bring up subjective aesthetics again, I'm not too comfortable with the concept of adults wearing digital watches. Google Glass was a step in the right direction in my opinion--you can interact with a UI while looking straight ahead--but as you said, the camera and other aspects weirded people out (there may be a future in contact lenses with similar tech?) Voice interfaces like Alexa are definitely in line with my view.