[Suppafly]

>It's easy to accidentally hit the microphone button that appears for any text field in almost all smartphone apps.

This. I do it pretty often, most apps have their own icon for it, plus the keyboard itself also has an icon for it. I actually use it a lot of times to send texts intentionally, but often have to start over because it picks up background speech from nearby people or the tv and messes up what you're trying to input.