I think that's all correct, yeah.
The whole thing feels like a celebration of the normalness of black people, while also being a celebration of the black experience as distinct from the white majority. That's a hell of a balance, and a testament to the ability of a director and cast to create characters who feel real enough that you can step into their shoes. When Killmonger is in Wakanda, he, the guy with that familiar American accent, feels every bit a foreigner. Pretty damn impressive. Also: he was a really compelling villain and I'm honestly not sure if he would be more compelling if his plan, which as SF points out does not make a lot of sense, made more sense. He feels like a force of nature, propelled by a violent maelstrom of emotion, and if his methods are all over the map, well, so is he.