I’m new to the fandom too, but from what I’ve gathered it was after Zazie Beetz was cast that they decided to make her black. They didn’t make Amber black and then look for a black voice actress. It does LOOK sus and fall into the placeholder woc gf trope, so I get being upset at first glance. That’s also why Eve stayed the same, Gillian Jacob’s was cast and she was already white so they didn’t change her. This is just me assuming at this point, but I also don’t think they changed Eve’s look to match Gillian’s because Atom Eve has a cool and iconic look with her red hair and pink suit, and changing her to be brunette would be lame 😭 whereas Amber being another white blonde lady isn’t important or memorable, and in my opinion Amber being a woc who cares about her states comptroller DID make her cooler and more interesting to me because I can relate to her now like I could relate to Eve’s personal life.