It’s a fundamental element in applied Augmented Reality solutions, whether or not in combination with spatial gestures and eye tracking. By sending information with your voice you are able to do your work hands-free. Pure efficiency. Your voice can therefore interact and navigate with the AR content but it can with video and remote connection request assistance from an operator.
Giving orders by voice is extremely natural and already fairly accepted, such as Siri, Cortana and “Alexa – next question, please!”