Originally Posted by Eddie
... They were Avengers well before Black Panther, and they were part of the second real "group" of Avengers, so an introduction in the second film makes a great deal of sense.
I think when it comes to BP's absence, it's more about the fact they are adding two albinos to an already whitewashed cast. Black Widow wasn't a member until long after Captain America, Hawkeye, Black Panther or the Maximoffs, and yet everyone understood it was for diversity. The only diversity the Twins provide is in the color of their costumes.
Does it make sense to continue avoiding the addition of Ant-Man and Wasp? Founding members of the team?