I understand where the OP is coming from, especially when it comes to hairstyles. We have been asking for curly hair for who knows how long but all we have are loose waves, a mushroom looking afro and corkscrew curls while the smooth straight hair type is used in a style every patch. The natural curl selection is severely lacking.
When it comes to skin tone and facial features, it's a bit more complicated because they are a part of what makes the in-game races. Midlander Hyur is not supposed to represent every Earth ethnicity. Highlander Huyr has better options for those looking for yellow undertones and some of their hairstyles are braided too.
Sadly there are no in game races which have African features by default and I think it's because we have not yet visited the in-game area that corresponds to Africa (or it doesn't exist in Eorzea at all). The same could be said about the appearances of some Asian peoples and the indigenous peoples of the Americas. Even if we did visit those places in-game, the real world is too diverse to crammed into the handful of face options we have and someone will undoubtedly be left out.
Having black people in a fantasy world that has humans doesn't make it any less of a fantasy.