If youre idea of the future is one where humanity has homogenized into more or less one ethnicity, it wouldnt look anything like the actress cast as Liet.
No, my idea is a future where humanity treats skin color as nothing more important than hair or eye color; and if Liet (black woman) is Chani's mom then no wonder she is brown; but it still makes sense if Liet is not originally from Arrakis but rather one of the more 'free' planets.
The fremen are pretty much explicitly in the text of middle eastern descent, and more importantly they are a very long term mostly gentically isolated enclave that has been running from oppression/persecution for thousands of years by going to more and more isolated planets. Making them diverse is counter to their story. On the flip side, both Harkonnen and Atreides sides are portrayed as being diverse and what not.
I don't care what part of middle east you pick people from, as that's never strictly covered, but the fremen should definitely be less diverse than other groups if you want to tell the story like it's written. That said, it doesn't bother me much. Now if they cast a woman as a Tlelaxu... that's pretty much a riot worthy mistake.
Well the biggest issue with that is Aldarion posted Herbert's description of Chani and she was a fiery redhead; so how is that supposed to happen if her mother in the real story was a Fremen?
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