Voice UI has some use cases where it is great and some use cases where it is terrible. "Fire and forget" commands are great. "Hey alexa, set an alarm for 8am".

Voice UI has some use cases where it is great and some use cases where it is terrible. "Fire and forget" commands are great. "Hey alexa, set an alarm for 8am". Once you trust alexa to do these tasks you don't need any feedback. But tasks where you need constant feedback are not well suited to voice UI. If you accidentally blast music through your hi-fi asking alexa to "turn it down a bit" 4 times and then "turn it up" finally to get to a nice listening volume takes much much longer than turning a dial while listening to the auditory feedback you get.