Don't really understand the point of wearables as a 'general purpose' do-everything device that is also basically a slave device to a smartphone. And it seems like most people don't either hence the massive tanking of smart watches full of bells and whistles, while the real success stories are those that do one job very well (eg fitness tracking).
With wearables the obvious benefit of being on the body is that it can monitor the body, hence obvious applications are fitness and medical-related. Most people already have a phone as a general-purpose mega-powerful device that can have multiple apps and also act as a hub for multiple subsidiary devices. There's no point in having BOTH a smartphone and a powerful, super-smart smartwatch.
Of course the evolution of the 2 could lead to a smartphone that's essentially a giant watch that covers the whole forearm like Predator's
Terminator icon in lieu of Predator :) ---------->>>