Movies are always changing in pre-production, with scripts being written then reworked or completely thrown out, directors changing, and casting changing, with some of this even bleeding into production depending on the circumstances. In the case of Black Panther: Wakanda Forever it looks as if Shuri and Namor were going to have some hint of a romance between them, though as we know this didn’t make it to the final cut.
Many audience members felt that there was something palpable between the two characters in the film; what they may have witnessed is something that was originally meant to be there and then got cut. Wakanda Forever is a love letter to Chadwick Boseman and his character T’Challa. It is already emotionally charged, weaving together the love and grief tied to his passing, and adding a romantic love interest that may have been too much or even too jarring for the story.