The bigger problem is that these two ladies are bomba magnets. Portman was the worst part of Star Wars (while maybe not the worst but up there) and the first 2 Thors.
C'mon now, it's ok to hate Thor 1 and 2 but they certainly weren't bombs. It's funny how Disney have changed the landscape and what "we" think of as a bomb over the last 10 years.
Thor 1 had a budget of 150 million and it made 449 million at the box office. It has a 77% critic and 76% audience rating. Far from bombing.
Thor: The Dark World had a budget of 170 million and it made 644 million at the box office. It has a 67% critic and 76% audience rating. Also far from being a bomb.
tl;dr - "You're calling me out on my double standards and I don't like it."
Either straight, white, male characters remain straight, white, and male, or all characters need to be race/gender swapped. Going after only white people shows you for what you are. A racist.
Marvel and DC comics were founded in white America 60-80 years ago. Back then it made sense to only market to white men, that was their audience. And when it comes to comics it most likely is still their primary audience today. When it comes to the movies though, they are truly on a global scale. I'm fine with them doing things to appeal to the global audience where it makes sense.
Female Thor I am fine with as I liked it in the comics, it's great. We still have no idea if or how much the film will follow the comic book.
The Eternals, yeah, changing genders and race for those characters make sense because they are not very well known, even within the comic fandom. Obviously if you have read them and love them it may hurt to see what they did to some of your favourite characters but the comic audience fans are going to be very small compared to a potential billion dollar film. Also, The Eternals aren't like the X-Men where their characters went "international" in the 70's "reboot", pretty much all the Eternals are white males, barely any women at all.
Shang-Chi, swapping him for a white man doesn't make any sense, first of all due to his name, secondaly because there is Iron Fist if they want a white martial artist. Yeah, if he builds a legacy through 4-7 films and wants to pass his name over to a white dude, I'm fine with that!
They are the only "issues" I can think of with the announced slate of MCU films.
I actually told my wife the other week if they reboot the X-Men with a black Professor X, I am done with the MCU movies. I tell myself that now, but would probably change my mind as soon as the trailer is released because Marvel Studios hasn't let me down yet.