Imagine trying to explain this to your grandmother: if you want to get back home, press this button, unless you’re reading an email or listening to a voicemail, in which case you should press the same button three times, but slowly. (But not so slowly that you accidentally launch Siri, which is triggered by pressing and holding the Digital Crown button.) My hunch is that most of the confusion navigating the Watch comes from Apple’s decision to overload the Digital Crown with too much functionality. You press it if you want to check the time, launch an app, re-orient the app view, or go back in a nested set of screens. Once you get the hang of it, there is some logic to each action on its own, but as a group it’s far too muddied. The side button, by contrast, is the very picture of consistency: no matter where you are in the Watch interface, if you press it you launch the “friends view” where you can call or text your favorite contacts.

Good piece by Steven Johnson on the somewhat confusing Digital Crown options available on Apple Watch.

I was initially confused by the behavior of double-clicks and zooming to launch apps, but I got the hang of it relatively quickly. It’s undeniable, though, that the combination of click and zoom input in a single knob can be tricky to explain.

Compare that with the beautiful simplicity of the side button: it always brings up the Friends UI, even in views such as Notification Center and Glances. When these types of modal views are shown on the iPhone, for instance, not even the Home button can immediately go back to the Home screen (it’ll dismiss Notification Center and Control Center, but it’ll remain in the foreground app, requiring another click).

This says a lot about the importance of communication features in Watch OS 1.0: the hardware and software of the Friends interface can supersede everything else with a single click.