Keeping things the way they are because that’s just how you’re familiar with them is problematic, due to most everyone in comic fiction being a white, cis-gendered guy. It’s not an overtly racist distinction you’re making, which is why you seem to feel you’ve come to it without prejudicial racial bias (“similar conclusions can be reached by different arguments”), but it actually IS racist by way of exclusion. “Don’t do something directly racist, but also just keep things how they’ve always been” is racist [and heteronormative, and sexist, and cis-sexist, and so on] because “how things have always been” are white, cis-gendered, and male. Therefore, you prefer things to stay white, cis-gendered, and male. The world has changed, but you want these characters to persist as vestiges of an outdated, slanted view of society.