Why does Uncharted the lost legacy not have Nathan drake in?

"Uncharted: The Lost Legacy" focuses on new characters, primarily Chloe Frazer and Nadine Ross, to explore a different narrative within the Uncharted universe. The game was designed as a standalone expansion, allowing players to experience a fresh adventure without Nathan Drake, who had concluded his story in "Uncharted 4: A Thief's End." This shift emphasizes character development and the rich lore of the Uncharted world beyond its iconic protagonist.