A Couple Things…

2 points:

  1. The 86% app use stat is a little misleading in that the majority of that percentage is Facebook.
  2. What a watch will be useful for is bite-sized bits of information, and while these bits of information will come via the internet (as you correctly point out), accessing these bits through a browser is an unnecessary and unwieldy abstraction; just serve them up within the desired context of the fetching app.