Ryan Coogler's regret about killing off Andy Serkis' Ulysses Klaue in Black Panther is still felt in the MCU to this day. Ulysses Klaue is one of the most famous villains from Wakanda's comic book lore, serving as T'Challa's archnemesis after murdering T'Chaka and stealing resources from Wakanda in multiple occasions. Klaue's live-action counterpart, however, barely got the chance to face Black Panther face to face, and his MCU journey was cut before it truly began.
https://screenrant.com/ryan-coogler-black-panther-klaue-death-regret-still-true/