"My own reaction is that if those whitebread brocoders (is that right? - Vulture Central's backroom gremlins) can create something that appeals to people of colour, then that rather explodes the argument that only people of colour can divine and then service the desires of people of colour."
On one hand - you are 100% correct: Competence should be the only measure.
On the other, you are somewhat less correct, because the simple truth is that people just don't want to feel like they are in the minority.
That's not to say that that isn't a relic of a tribal past that, despite all our genius, is still only about 1/30th of the distance to our (apparently) recognisably 'human' beginnings. It is such a relic but it's a fact and companies know that thus allow it to influence some of their decisions.