A thought hit me today regarding this current take on Wakanda. To us, it is a unique nation with a unique culture, unique identity, and so on. We might have different visions of it, but we know it doesn't have the ills of modern Africa.
Now whether Coates is just ignorant of what its history means or he views the traditional view as simplistic, unrealistic or even childish, I don't know, but he created a this harsher more "real-world" vision of Wakanda.