Exactly, you want to keep having your society differentiating clearly between Americans depending only on their skin color, instead of creating the basis for a future where our children dont care about color.

The great example for me is how europeans learned to not care about blonde northern hair vs dark southern hair, straight western nose vs eastern crooked nose, red-heads. etc.

Not to say that, typically, the more northern and western you are, the higher the chances of you being well off in life. But the fact the rules don't perpetuate that notion ad infinitum made it a lot easier for people to stop looking at individuals as members of a specific sub group, and just see them as regular Europeans.

I believe the African american experience will never be accepted as a normal American experience for as long as you make sure to differentiate it as much as possible. And the more specific rules you make for those people, the harder it is for everyone to have the same experience and understand each other.