Those “capabilities” are socialized. Because race is a cultural construct you learn as part of your socialization. The way people talk does not flow from any genetic reality, it flows from their identification with a particular speech community.
Look, we aren’t going to argue about this ad nauseum on this thread and have it descend into a bunch of posts where Vance tells the world how it is and refuses to learn from people who know better. It’s been discussed elsewhere, if you are interested: