1 - You're OK with Fremen being white (unspecified reasons, even pasty-white, "welcome to Scotland" type Fremen a la Dune '84, despite your argument about humans and melanin)
2 - You're OK with Fremen being black (citing a population of a tropical rather than desert region)
3 - Under no fucking circumstances can there be any skin colour diversity on Arrakis! Because "they should all be black" and Congo.
correct. *science*
Fremen are humans from earth. Before the Butlerian Jihad, the planets of the empire were populated by humans of Earth.
While it's certainly possible to have Africans travel into space, once you have 20,000.00 years (the date of 10191 is from the establishment of the Golden Lion throne) of space travel, the need for black people to be black kinda fades away.
If the humans that populated Arrakis have had a change of melanin because of their living there (i dont think Fremen would sunbathe often, and
they live underground) then it would be fairly uniform. Because ALL of Arrakis is hot. Arrakis is not Earth, but Earth is a good comparison. I'm sure you are well aware that all us Glorious White People are essentially africans, *except* we don't live bare-chested under the scorching sun.
Paul is the Kwisatz Haderach.
The lore of Dune is based on the effects of the Butlerian Jihad. After humanity descends into near-extinction due to their overreliance on thinking machines, and the subsequent destruction of all these during the Jihad, there follows the creation of the Guilds, which essentially try to replicate what the empire used to do previously with the thinking machines, but with humans. So you have things like the Mentat Guild, which, more than "trains", BUILDS human computers. The humans of Dune are mere tools, they are drugged, hypnotized, genetically altered, trained to death, in order to become Mentats, Warriors, Bene Gesserit, Navigators, etc.
The Bene Gesserit have a number of extraordinary powers, due to this selective breeding. Within their ability, they can manipulate the genetic code of the children they bear, and they have been working for centuries in the attempt to create the perfect human being, the Kwisatz Haderach (Hebrew for "here and there", the biblical Ubiquity, or to be in multiple places at the same time).
Another power that is relevant is ESP, however the Bene Gesserit have limits in their prescience. Navigators for example have a similar power, to envision the travel of a ship through space-folding while using a Holtzmann drive. Dune makes it clear that males and females have different limits on their abilities, so men can't do what women can, and vice versa.
When Paul is born, he is already an example of biological perfection. He is recognized by Mother Superior Gaius Helen Mohiam as being a stepping stone in the Kwisatz Haderach, but note that the B.G. doen't actually know what the fuck the KH actually is. They simply believe this is something that COULD exist, but do not know what powers it will have, or how it will manifest. They are in fact expecting it to be something that they can control, which is why they have been spreading propaganda on all the planets of the empire, so that when the KH actually manifests, the people of that planet will have a prophecy that makes them want to follow the KH.
What instead happens is that Paul is much stronger than what the BG had planned. He drinks the Water Of Life, which
kills every male who drinks it, thus acquiring full omniscience which the BG think is impossible.
Dune is full of this warrior machismo. At least Dune 1 recognizes this in the scene where Momoa says he's been attacked by Fremen children and they nearly killed him (in the book the children massacre the Harkonnen, while the adults are compared favourably to Sardaukar warriors).
And Timothee Chalamet is, physically, someone who i could probably murder with my bare hands. Just leaving out the emo acting he's been given, he just does not look the part of someone who has the means to kick the ass of a fremen. He couldn't kick the ass of a granny, much less of adult Fremen.
Why do you think i like DLD, because .. "i like it"? I promise you i have watched many films in the 80s that were absolute shit, Dune 84 just happens to be a great film. If they want to reboot it, then they should have rebooted it better, not worse. I wouldn't say it's the worst film that i have watched, but it's fucking lazy from many points of view, pretentious to fuck (well, it's not The Green Knight, granted), and generally poor in most directoral choices, but i've seen worse.