Back in the '60s & '70s, if you wanted a superhero of colour or wanted to give a white superhero a significant other of colour, you’d create new characters to fill those roles.
Now in the 2000s, if you want a superhero of colour or want to give a white superhero a significant other of colour, you take pre-existing characters who were white and race-swap them.
Progress!
Shaft needs to be played by a fat white lady from St. Louis.