Thanks for stating the obvious?
Most details in movies are, in fact, "unnecessary." The scale of the space jockey set in ALIEN was initially deemed "unnecessary" by the studio. It wasn't "necessary" for James Cameron to recreate the miniature model and full sized set of the Narcissus from scratch in the opening of ALIENS. He could've just started the film from Gateway station, but he made some decisions to help bridge together the first movie to the second. I merely suggest how de-aging tech could be used in the opening of Blomkamp's film to help bridge together a 31 year old film to a new sequel, which could help establish the choice the ignore Alien 3 and Resurrection, in a thread about de-aging technology. Pointless comment.