What do you think about a future companion who is mute where his only form of communication is through body language, facial expressions, emote texts, murmurs, humming, and grunts? You would still need a Voice Actor to convey the other sounds he makes without being able to say words like a grunt of disgust compared to one of sadness, an exasperated sigh, or humming to himself when he is happy.
Emotes:
"Speaks-Through-Soul frantically waves his arms to alert you of the coming danger!" (quick repeated grunting sound)
"Speaks-Through-Soul eyes widen, tucks his head, and smiles in gratitude" (soft bellowing sound)
"Speaks-Through-Soul whistles to get your attention" (sharp whistling sound)