Personally, the Apple Watch is interesting to me not because it’s a watch. Rather, it’s interesting to me because it’s a smaller-than-normal touchscreen attached to a cellular antenna, and one that’s not necessarily on the most reliable connection. It helps me look past the device, and to think about how someone will interact with my work under those conditions. Once I do that, I can start to design accordingly.
See also: Device Agnostic (2014) by Trent Walton.