Why would anyone consider the opinion that Africa being primitive at some point was incapable of some sort of literature and as such isn't a relevant subject for study, a valid thought?
Be it primitive or advanced in culture, no race should be considered as inexperienced. The experience may defer but that doesn't invalidate the the experience or culture of a people.
The culture of every race is worthy of being studied comparatively to other cultures. The nature of the global space is one that is complex and one culture loses its beauty once the 'lesser'culture is swept under the carpet.
More thought on this...