Get a text message on your Apple Watch that you want to reply to via typing without using your iPhone? Can't. Ditto with emails. Can't make phone calls. What happens if you go for a run and have an emergency but don't have your phone with you? Ultimately I don't see this product answering the 'why' question for consumers that was very obvious with both the iPhone and iPad. I predict lukewarm sales. And yes, I know people doubted the iPhone and iPad too. I don't think that's reason to not doubt the Apple Watch.