Proxima doesn't speak in Endgame because Marvel reportedly didn't want to pay Carrie Coon more
The actor would have made a bigger deal about it, but didn't want to watch the movie.
Screenshot: Marvel/Photograph by Fabio Lovino/HBO
Everyone remembers Proxima Midnight, the adoptive daughter of Thanos who appears in Avengers: Infinity War. Current White Lotus guest Carrie Coon provided the voice and facial capture for the character in that movie, and although Proxima was killed by Elisabeth Olsen’s Wanda Maximoff in Infinity War, Coon had the opportunity to return for Endgame. However, she made a different fatal error: she asked to be compensated appropriately for her work.