Right, it’s not like people born deaf are just completely useless as humans. Just like we have sign language and there is a whole concept of body language alone

Right, it’s not like people born deaf are just completely useless as humans. Just like we have sign language and there is a whole concept of body language alone is enough to show it would be possible for them. We have people like Helen Keller who existed. In Jean M Auel’s Earths Children books the Neanderthals communicated via hand gestures and vocalizations.