Because by your rules black people aren’t allowed to have fun fantasizing about being a pirate sailing the high seas in colonial England, a trans man can’t be in a WWII fiction fighting nazis, a woman can’t be in a medical drama about stopping the cholera outbreak.
So if they can’t be key roles (i.e. important at all to the plot) minorities should be relegated to background characters even in historical fiction?
Also what show has half the cast being trans or non-binary or whatever? I could use something interesting to watch.