What else hasn't been said about this portrayal?
I still remember when they introduced Chadwick on-stage for the reveal that he would embody the king of Wakanda. I can tell you that I was hesitant, mainly because I hadn't seen his other works, and also because I thought the suit looked weird. Even so, he delivered, and the suit, it grew on me. So much so, that would prefer seeing the other suit over his solo movie one. Goes to show that one of the real heroes of the MCU is the casting director.
The accent. Oh god, the accent. Just like the other two things from above, it felt weird at the beginning, but once I learned the reason why they decided to give him an accent, all fell into place. Now, sure, I had envisioned T'Challa as the kind of diplomat who learned many languages when young, and thus would've had less of an African accent, but still, all previous portrayals of T'Challa had an accent, even if none felt like the one Chadwick used on-screen. I'd like to especifically remark on the ending of the film, where he is at the UN. There, the way he speaks, evokes the speeches of Nelson Mandela himself.
Also, as a person who not only is bilingual, but whose father taught him that same language, I love every single scene with him and John Kami. There is a sense of inside joke in that Civil War scene, that I really wish we could've seen the two of them before. Really, every key relationship in Black Panther's movie felt lived in like no other Marvel movie felt, at least for me.
I'm glad we had Chadwick portray the character, with as much gravitas and style. If anyone was going to convince me that a man in a black suit was a badass, I'm glad it was him.