[kipchak]

I think t he difference may be how good the "bones" of the product are to build out on. The original iPhone for example didn't have 3rd party apps (outside Safari pages) or GPS/Navigation, Push Email or 3G that are now core smartphone features, but the experience of scrolling around and opening apps always worked well.

But if it was the reverse and iPhone was unpleasant to use and carry around for long periods of time due to it's physical properties like the vision arguably is, (at least as a "AR" device) I don't know if adding those features later would have saved it.