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In interviews, Jackson articulated that the battle between Aragorn and Sauron did not align with what Tolkien envisioned for the story. He expressed concern that this duel might dilute the weight of Aragorn's ultimate goal: to buy time for Frodo and Sam at Mount Doom. This sentiment reflects Jackson's intent to maintain the thematic integrity of the story, where the true struggle lies not in mere swordplay but in the profound sacrifice of the central characters.
Additionally, Jackson's decision to present Sauron as the fiery Eye for the majority of the trilogy was rooted in narrative consistency. Introducing him as a physical entity at the climax could disrupt the established vision and tone cultivated throughout the films.