A reason to exist
A dedicated device must do something that a phone cannot do just as well. Ambient access, hands-free operation and context-aware assistance are promising, but only if users can rely on them.
Battery life, microphones, connectivity and social comfort are part of the product experience.
Privacy is tangible
Always-available sensors raise questions about when a device is listening, what is stored and whether bystanders have a choice. Clear controls and visible indicators are fundamental.
A useful assistant should not require people to surrender all contextual information by default.
The long adoption curve
Successful new hardware often starts with a narrow, repeatable advantage.
The winners will make intelligence feel natural without making everyday life more complicated.