Yea that’s a crappy excuse. Hickman did more to expand Wakandan lore than most writers that have come on the book and he wrote the man exclusively in teams. This idea that black writers are somehow incapable of performing their damn job of writing T’Challa because Wakanda is just so interesting is reductive and dangerous reasoning when taken to its logical conclusion. It assumes that the only way to develop Wakanda is to sideline T’Challa or that T’Challa is at some point disposable to his franchise in a way his white peers are not.