Even if you just throw out the real world political context of how terrible it is that they have Martin Freeman's character in Black Panther be a CIA agent, that character's role in the movie points to a bigger problem of Marvel Studios' persistence in screwing over the television writers and actors. Coulson would have been a great fit for that part, without all the baggage, if they had just had the sense to cross over with Agents of SHIELD at any point in the five years leading up to the movie.