When Bluetooth was first being introduced into products, there were product managers who honestly believed that the "killer application" for the technology was for stores to run a Bluetooth connection that would accost customers with ads as they walked past the front door. They believed that linking a telephone headset to a phone wasn't solving any problems, since you could do the same thing by plugging in a wire when you were near the phone. We now know that the application for Bluetooth is in "near-range remote connectivity", for phones, stereo speakers, etc.
With smartwatches, the same conundrum is presenting itself: people fail to realize what you would do with it, and what you simply would not do with it.
You would not read an entire email on it. You would not read a PDF file on it. You would not visit a traditional website from it.
You would glance at who sent the email, to see if you need to dig your phone out of your pocket and respond immediately. You could read short text messages.
Your smartphone will continue to serve as your Message Centre. Your smartwatch will serve as your Notification Centre. Your pager, if you will.
So you peak at your watch to see who sent you an email, but then you have to do the same thing on your smartphone to read it, duplication. I get 10-15 emails a day, as i'm not that important in the world, but know a whole bunch who get 100+ a day and they will not do as you suggest. There are a huge gaggle of lazy yobs out there who just won't do it.

