Re: Still need that "killer app" ?
"Unless - or until - a wearable device provides a unique feature"
For instance tracking activities while not carrying a phone? Or mapping without a phone? or music while running...without a phone. Scuba Diving (Garmin Descent) without a phone.
Your phone isn't a part of you, you will survive leaving it at home. Without it, many activities become considerably more pleasant, especially given the bulk of modern phones.