When we built the first version of the DMJBot mobile apps, audio input was near the top of the list. Not as a nice extra — as one of the reasons to have a mobile app at all.
The use case we had in mind was very specific:
"I'm away from my laptop and an idea hits me. I want to do something with it now — not just store it. I want to think it through, get some pushback, maybe turn it into a task for later. And I want to do all of that from my phone, fast."
Notes apps solve the first half of that. You write the idea down and it waits for you. But an AI assistant can do the other half — react to the idea while it's still warm. The only thing standing in the way is the keyboard. On the go, walking, driving, in a queue, you're not going to type three paragraphs. So we added the microphone.