I don't think they're putting messaging before story. I think that's how you (and others who share your perspective) are viewing it. It's not necessary to view it that way and, to me, it seems unhealthy.
I'm not sure how this could be considered a new way of entertainment. Is it because Black people are telling the story? Because culture and social issues and the drive for authenticity aren't new for Disney, they're at the heart of Epcot (an inspirational, progressivist take on the past, present, and future) and Animal Kingdom (with its emphasis on the environment, conservation, and culture).