As mentioned in my other comment that I just posted a few minutes ago, you're making the comparison to blacks portraying roles against type as though there are an equal number of productions where this occurs as there are white productions where this occurs. As an actor of color, and someone that has seen and read lots of plays, this is simply not so.

Until the number or mainstream experimental colored productions and caucasian productions becomes equal, then your argument comes from an invisible privilege you get to enjoy likely as a person not of color.