I do believe that there are African Americans who have thick accents. My mom has a thick accent; my relatives have thick accents. But sometimes you have to adjust when you go into the world of film, TV, theatre, in order to make it accessible to people.
As a necessary prerequisite to the creation of new forms of expression one might, I suppose, argue that current sensibilities respond uniquely to the notion of exhaustion as exhaustion, although that does de facto seem rather limiting.

