When designing for Mac OS developers have got to think in terms of hours, their app has got to be powerful, and ready for time demanding tasks that could not be accomplished on a mobile device, at least not as efficiently. When designing on iOs for iPhones developers have got to think in terms of minutes, their app has got to be powerful and yet ready. It must combine the best of the mobile world while remaining decently efficient when needed. When designing on iOs for Apple Watch developers have got to think in terms of seconds, the app cannot be a blend copy of it's iPhone counter part. It has to be a "get to the point" experience with little-to-none time wasted. 4 keywords have to be remembered Inform. Control. Track. & Monitor. So again , Mac OS = Hours iOs for iPhone = Minutes iOs for Apple Watch = Seconds (iPad sits somewhere between minutes and hours but you get the picture) With this in mind, hopefully the people (especially the devs out there) that keep saying the Apple Watch doesn't have a purpose will think it through. As a developer that's when I had my first breakthrough. Stop trying to miniaturize iPhone Apps, strip it down to its core and leave only what matters most.