As I noted last time this subject came up his character didn’t really fit into the tone or the storyline of the Peter Jackson movies:
FWIW Jackson said that fans shouldn’t take Tom’s omission to mean that the Hobbits’ encounter with him didn’t happen in his version, just that it was an “untold” part of the story that happened between the scenes. That this is even plausible kind of underscores how inessential he was to the story.