After thoughtI read the article, and to some extent agree with it.But, what is faster and least shaky in terms of picture taking? From my experience, The smartwatch is. It would be an interesting to see test how fast a person can get a smartphone out of their pocket. In quick moments it doesn't work unless you are already holding the smartphone in your hand. I have never tried Google Glass, but think it would be faster, touching it, or saying "OK Google, take a picture" , because you don't need to aim just look at what you are taking a picture of.
I agree with the idea of not wanting to use fine motor. I am very good at reading very small fonts, but not at fine-motor finger movements. So as long as there is full control over fonts and icon/button sizes , I think Google's ideas on wearables are great. Just plan on getting Google Glass, which I am.
I think the bigger issue is being compatible with rooted/custom ROM phones. If the smartwatch doesn't pair, hackers are kind of left no choice about creating their own custom ROMs for the smartwatch.