(LES) Why wasn’t Sue Storm black in Fant4stic?

In 2015 Fantastic Four movie (Fant4stic), they made Johnny Storm black. But Sue, who is traditionally his biological sister, was kept white and they’re siblings by adoption.

Now, I’m not saying that there’s anything inherently wrong with race swaps or adopted siblings, but they could’ve just made Sue black as well.

What, did they think two black people in the main cast would be too much for audiences to handle?