Unified UI Unicorn
In my humble opinion, the goal of a unified UI is similar to chasing a unicorn. Application of process management rules should be followed as each device will be used in different ways. The result of a unified UI is that everything that should be at our fingertips from the start (or Desktop), gets buried deep in a folder, is hiding behind a right click or worse yet, a slide to view screen. Dr. Who's solution is a sonic screwdriver. Unfortunately, not everyone is a time traveling scientist so its utility will be lost on many. Power users are still executing DOS commands. This begs the question as to why so much time and effort is being wasted on a unified UI when there are so many things that could use a little graphic interface love. Besides, once Microsoft figures out how to make Cortana fully functional, our UI will be our voice, assuming we don't need to remember the DOS command to access the function we need.