Besides, they are very silly in their approach. Why go for dark skinned Norsemen or English or such? You can do an Ancient Greece show, even include or focus on Egypt, Persia or go as far as south of Egypt, if you are daring. And if you go the Ancient Greece route, you will have the bonus of adding tons (and TONS) of gay people of any sex and nobody would mind, object or bat an eye; they'll endorse you! No need for all this nonsense, when you have source material ready and waiting.
Same with all the black Achilles, black Boleyn and all that. What, people from the whole frigging African continent don't have a legendary warrior, worth showing to the rest of the world? Or a dynasty worthy of a drama series? I somehow doubt that. I can think of at least 2 or 3 for every category, and I only read a couple of books on the subject, not even enough to be considered an amateur (and one was the travel logs of a 14th century guy).
Just saying, they are missing opportunities and pissing their viewers off, at the same time.