To the main character voice Thing:
You should think of it as only written text. That is in fact quite common even in high budget rpg games nowadays. There is no actual voice for your character, I guess to make it more immersive.
In AHC it has to be voiced in sapi because we can't read that written text. Oh well, we could using a Braille Display... But I think you get my Point.
Well, the mixture is a bit strange nevertheless. I don't know a game where the main character has no voice but talks that much at the same time. But I don't mind at all. We will see how it fits into the main Impression of the game.