Stephen Johnson zeroes in on some of the challenges using the Apple Watch, and specifically the Digital Crown (the main controller for the device, which sits on the side like an analog watch). I don't own one, nor have I had an opportunity to use one. Johnson seems to have nailed the problem by observing that there's no safe place for a user to navigate to and "reset". For a lot of users, and especially those who are just learning, memorable linear pathways from a consistent starting point are what they want. Like learning a city subway stop by subway stop, once those pathways have been learned, users can branch out and discover new features.
I'm always fascinated by how product decisions get made, and in this case, how Apple may have compromised their usual clarity when it came to defining the behavior of a critical interface element. I don't know if this anything more than a stumble for Apple, a sign of them letting technological complexity get out of hand and dictate the user experience. It is certainly intentional and on the other hand may reflect a new outlook for how Apple approaches user experiences.