"Google Assistant to Reduce Excessive Narration and Chatter"
Google Assistant will soon replace vocalized confirmations with a chime for simple smart home commands when you are in the same room. This change is based on feedback from the Google Nest community and internal trials. The chime will apply to all smart home devices in the room, including outlets, switches, TVs, speakers, and fans. However, you will still need to issue a command within the same room to get the quiet response.