I say this as a fan of diversity: I don't see how this is an issue of "finally starting" to diversify its characters. Admittedly, this is the first person of apparent African origin that I can think of in post-TNG trek off the top of my head. (TOS had Uhura and Dr. M'benga). Searching the Internet, it looks like Geordi was born in the African Federation, but I didn't remember that ever playing a role in an episode. Also, would it have mattered if instead of being Captain Ndoye she was an African-American named Captain Johnson or what have you? (Of course, Captain Ndoye could have been born in America, France or wherever.) Yes, more diversity is better than less, but what's in a name, as some dude or another said.