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I have to admit I think clicking languages like Zulu and Xhosa sound cool.
After looking up the topic on sites such as WALS, I noticed that only southern African languages in the Khoisan and Bantu families have these kind of sounds (with the exception of Dahalo in Kenya). Why do you think it turned out this way? "Th" sounds are uncommon, yet they are spread throughout the world, as are "pharyngeals".
This is more a discussion than a WI, since chances are the POD would go so far back that history would be unrecognizable. (Except if Shaka Zulu goes north instead of south or something). . .