Whisper Mode & Intelligent Volume
There’s a lot of room for improvement when it comes to how Siri responds to requests — specifically in the volume area. While Apple is apparently working on a “whisper mode” for those times when you don’t want to wake up your sleeping neighbors, it has yet to implement it.
But it could go a lot further than that. Siri could, for example, detect how far you are from your device or how loud the ambient environment is and set its response volume based on those factors. The iPhone already has the ability to pick up this ambient data. It’s just a matter of implementing it into the Siri platform.