Let me tell you, as someone who owns smart watch already, I don't pull out my phone nearly as much as I used to. Not every message or notification requires an immediate response... In my experience most of them don't in fact.So you can look at your wrist, but the question then becomes do people still pull out their phone anyway because it's faster to type out a text when Siri gets it wrong? Do you pull out your phone to check a map because it isn't detailed enough on your watch? Do you pull out your phone to view a web link or picture or video someone sent you, because the watch screen is too small? How useful is the Watch, really, if people still pull out their phones most of the time, as I suspect they will?
And the mapping part seems to be more for turn by turn than anything else, for which the screen size should be sufficient.