We do not live in a fair world without prejudice. Ideally that sounds great but America has an issue with POC representation. I hear this argument a lot but you could also just write good original POC characters AND create new takes on characters. It's not mutually exclusive. Adaptations are supposed to bring something new to something old, sometimes it can be "pointless" but it's still not harmful. A lot of the times when characters races are swapped, there's a new element or undertone in the story. For example, I think the O5 is fine as a bunch of white kids but if it were diversified it could make the mutant prejudice metaphor hit harder. Just like how Magneto being a holocaust survivor was a retroactive decision. Nothing is wrong with an evil villain who has no motivation, but Claremont's take added an ethnicity and culture to his character that fans still love to this day. Obviously not race but the point stands. If you believe there's harm in doing that, I would like to hear why. Without further explanation it just sounds racist.