Chinese is dialectical meaning all the languages share a common parent language. That’s not the case with African languages. Ok let’s look at countries like Nigeria and Ethiopia. Why would Igbo, yorubas, or Hausas choose a Neighboring language over their own especially if the country was a forced assimilation. Same thing with Ethiopian why would ahmarics, Oromo, and tringiniya speakers choose a neighboring language over their own. That’s asking for a power imbalance. Each group will definitely try boast and say there’s is the best the others should adopt. Use your head that will never and can never work this is the real world not a fairy tale