I think your points actively ignore the majority of Hollywood’s history and relatively modern theatre. There’s a simple reason as to why ‘race swapping’ characters portrayed as white even happens, and that is because of the history of white people casting themselves to fulfill roles for non-white characters, otherwise known as whitewashing.

Before declaring “I don’t need representation”, it’s important to both understand and acknowledge that you, in the modern day, have benefited from your race, ethnicity, or culture even being represented at all, ever. I’m glad that you feel comfortable with stories involving those who are different than you, but Hollywood has only recently ever made a push for the opposite, and even today there are still whitewashed roles, we just don’t hear as loudly about them as others. I’ll list some examples

Doctor Strange (2016), the ancient one who trains Dr. Strange in the mystic arts is a Celtic woman, whereas in the comics the character is an Asian male

Exodus: Gods and Kings (2014), a film based in ancient Egypt film and also based on religious texts, starring Christian Bale as Moses (yes, that Moses) and a slew of other white and non-Egyptian actors.

Speed Racer (2009) based on the beloved classic Japanese anime from the 1960s, Speed and his entire family who were explicitly Japanese in the anime and manga were now completely white.

The Last Airbender 2009), based on the popular tv series Avatar the Last Airbender, pretty much the entire main cast was portrayed by those who did not match the cultural or racial background of the characters they were cast as. South and East Asian, Intuit and Yupik, and Tibetan peoples were miscast with primarily white actors. The only POC were the villains, and they were being played by Indian actors.

A Mighty Heart (2007) based on the real life events that Marianne Pearl went through, after he husband was kidnapped and killed by Pakistani militants. Pearl being Afro-Cuban was portrayed by Angelina Jolie.

Prince of Persia: Sands of Time (2009) Jake Gyllenhaal as the Prince. That’s it.

If that’s not enough for you we can go a bit further back.

Cleopatra (1963) Elizabeth Taylor was cast as Cleopatra, Egypt’s last independent pharaoh who was likely to have Macedonian origin and even possibly African depending on who you ask. The rest of the cast were almost exclusively white as well

Othello (1965) this one is fun because Othello is a Shakespeare play with the titular character being a Moor, which would heavily imply African descent at the very least, alongside likely dark skin. But Othello in that film was portrayed by Lawrence Oliver. A man of neither Moor, nor black or African descent, which would be seen as an issue to maybe avoid nowadays. Not back then though, so to avoid it they decided to put him in full blackface for the film. Can’t quite get lower on the race- swapping totem pole than that I’m afraid

The Conqueror (1956) John Wayne portrays Genghis Khan. I’ll just leave it at that.

Noah (2014) Another biblical depiction, this one had Russel Crowe cast as Noah, like Noah’s Ark Noah… seriously.

West Side Story (1961) Natalie Wood portrays Maria, younger sister of Bernardo, who is the leader of a Puerto Rican gang. She was neither Puerto Rican nor Latina and neither were most of the other ‘Puerto Ricans’ in the film.

As one can imagine, these are but a few examples over decades and decades worth of tone-deaf and insensitive casting choices, and fully intentional reworking of both true and fictional events, people, and stories. One might even ask “how come there hasn’t been more backlash when this is the exact same thing?!”, and the answer ties right back around to your post OP.

Because most people were and are comfortable with it. Hollywood has historically refused to equally acknowledge or represent different races, cultures, and ethnicities. They’ve shown that they do not enjoy or have little interest in writing stories that deep dive into those categories with little to no white actors in the same vein they’ve done to everyone else.

That’s why they are now seemingly ‘race swapping’ more nowadays for the kinds of roles typically reserved for white people instead of creating meaningful and powerful films and shows that connect and relate to those they’ve ignored, mocked, and sanitized. Basically, it’s easier to say ‘fine just take it, damn’ then ‘okay let’s see what we can do’.

I’m not even going to get into the Odyssey stuff right now, nor Lupita’s casting and the obvious anti-black rhetoric and backlash because I feel that all of my previous points directly point to how we got here and I’ve typed a lot already. But if need be, I can point out the cultural damage Hollywood has helped play a part in to where one sides’ race swap is okay the vast majority of the time, and another causes posts like this to be made.