Thorgnarok was a really solid parable about coming to terms with the realization that one's success is built on blood and stolen land, and that one's heroes were monsters. But it has to segue into the Thanos plot so there's no room in the story for actual reconciliation and rehabilitation.
Black Panther ends with T'Challa ending his nation's isolationist foreign policy and enacting a compassionate form of N'Jadaka's vision of an engagement policy; it's admitting N'Jadaka had a point, but the impact of that engagement policy can't be shown realistically because it would change the world too …