The watch is independently able to show the time. It also has built-in time-display capabilities in the SDK to limit the amount of traffic going between watch

The watch is independently able to show the time. It also has built-in time-display capabilities in the SDK to limit the amount of traffic going between watch and phone (i.e., you don't have to manually update a timer or clock display from your own code, the watch does so locally). Seems like all of this is meant to reduce processing on the watch side, and also to minimize the amount of data moving between watch and phone.