Lately there have been a number of casting choices for movie adaptations that have been met with some level of controversy and obstinance. I started to notice it in full force around the time that Idris Elba was cast as Roland the last Gunslinger in the adaptation of Stephen King's The Dark Tower and it came to a head with things like The Ghostbusters' all-female cast.
Since then it seems to be a pretty regular occurrence for a casting choice like Michael B. Jordan as Superman - or even something more innocuous like having a black alternate reality comic book version of Reed Richards be met with a derisive comment like, "...Because no one can actually create a new character that is black..."
This is a point of view that completely misunderstands what representation really means to people of color, and why it is so important.
Having read many Marvel and DC books across multiple eras, I will agree that, yes there are plenty of black characters like T'Challa, or one of the several incarnations of Goliath - an accomplished scientist on par with Hank Pym (Ant-Man) that could be utilized for film adaptations. John Stewart is a black character who is one of the finest Green Lanterns to carry the mantle. Spawn was black before he was killed in action and became an agent of Malbolgia. It is absolutely correct that there are lots of black characters out there that can - and should - be utilized for movie adaptations, or expanded upon in their original print universes.
And perhaps at some level there are changes made with a more cynical approach, that executives believe being more PC and changing traditionally white characters to black (or other races altogether like in Birds of Prey) will get more asses in the seats and increase Box Office takes.
People who take this stance, however, tend to miss a very important factor in all this while presenting an argument that - whether purposely deceptive or just misguided - is nevertheless based on false equivalence. Namely, the idea that replacing a white character with a black actor or alt-universe analog is just as bad as replacing a black character with a white/Euro-centric analog.
Given that, historically speaking until the last 50 years or so, the central power structure has been (and continues to be, if Critical Race Theory holds true) based on white, euro-centric control over socio-economic and other systems - in spite of efforts to adjust and change laws to be more accommodating to all walks of life - a change from a black character to white is a slap in the face to viewers (regardless of background) invested in those characters.
But a change from white/Euro-centric to another race is often simply a reflection of society, representation, and shifting priorities. It's a signal that creators are reaching out to a broader base of viewers or readers, embracing them, and welcoming them into the community.
In other words: No, Virginia, it is absolutely not the same thing to change a character's race from white to black as if you changed from black to white.
T'Challa, John Stewart, and Spawn all have distinct back stories wherein the socio-economic landscape shapes their characters. Two of the above-mentioned characters come from a background where they joined the armed forces in order to try to rise above their circumstances, and the other is a ruler of an African nation. It makes no sense whatsoever to their stories if they are white because it completely obliterates the underlying meaning, themes, and messages of their backgrounds.
Kal-El, on the other hand, is an alien who comes from another planet. Reed Richards is a genius who created an advanced research spaceship and decided to test it himself. Roland of Gilead is the last of his kind in a world that has moved on. In what way do these characters being white or Euro-centric shape their backgrounds? Long answer short, they don't.
I'll even concede that certain characters like Victor Von Doom, as the monarch of a European country has a background where whiteness/Euro-centrism is important to his worldview so it wouldn't make sense to change him to a black actor.
This is the lynchpin of the race or gender swaps, and where I feel that arguments are being made in bad faith time and time again.
I am white. I personally don't care if Captain America, Superman, Tony Stark, or other A list characters are portrayed by black (or Hispanic or Asian) actors in their movie versions, or if an alternate reality comic book portrays them as a different race, particularly if it doesn't change the original comic book's prime continuity. It is, however, extremely important for people like my partner, who is black and who has relayed to me multiple times how when she turned on the TV growing up, that when she did see people like her they were thuggish, nappy, or side characters, never the leads.
Here, then, is what is so important about an iconic, larger than life character like Superman or Captain America or Batman being portrayed by a person of color.
Certainly new characters can be created, and certainly they can become major sensations and Box Office draws. Writers, directors, producers and creative talent absolutely should continue to create and develop new characters that reflect the world around us and invite inclusivity of all walks of life.
But all that takes time, talent, and effort. Effort which executives may not wish to expend developing an unestablished property. It's not enough to have an on-screen portrayal of Goliath or Spawn or any of the multiple sidekicks or lower tier characters who are black. General audiences are not familiar with these characters and as important as it is to get them onto movie screens as well, it is so much more important to have an iconic character, a long-standing character, a front line character like Batman or Reed Richards played by a black actor, or to have alternate reality print versions that are black, Hispanic, Asian or other POCs. To send that signal to say yes a black man can be Superman - that's as important if not moreso than the success of a film like Blade or a Black Panther.
It's not lazy writing to provide people of color with hope that they too can be at the level of an Iron Man or a Batman. It is, however, lazy thought to think that changing white characters to black is somehow the same as changing black characters to white.