Voice is still a very underexplored modality. Right now, it’s used mostly for dictation, but it could also be used for editing.
The funny part is that the tongue itself could act as a cursor or perform gestures, which sets this approach apart from other silent-speech methods.
I have never liked talking aloud to Siri or similar, but I could see using "voice" as an interface for so much more if I could speak silently to my device.