The stoic nods get a bit tedious, but silent un-subtitled "talking" is fine. I'd rather "fill in the blanks" and imagine what my character would say in the situation, than have the exact words given to them.

It's different in a game where the main character has speaking lines and a fixed personality from the beginning, but it doesn't really work here when there is such a vast choice of character designs. Are you well-spoken or rough? Polite or rude? Excited or restrained?

If they introduced such a thing now, unless your concept of your character matches the personality the writers give you (after all this time of working it out for yourself), it's going to seem wrong and out-of-character.