In a new interview with Hidetaka Miyazaki, the director of Elden Ring and a famous name in the FromSoftware development team, Miyazaki stated that the content of the Shadow of the Erdtree expansion was initially part of the original content of the game, including the details of the story and the explanations it provides, but this content was not compatible with the original experience.
The development team found that presenting Miquella’s story chapter separately from the original experience was the best option in this case, and thanks to this, the team was able to expand and explore this character’s story and details in a more extensive manner.