My thinking about Rose’s fathier line is that it originally set things up for her to be thrilled to see one up close and feel outrage at the way they have been treated.
With the line removed in a version of the film without further interactions with fathiers, Rose still seems interested enough in them to facilitate Finn’s scorn as he notices them being electro-whipped without implying there will be anything more to it later on.
If the space horses in IX have anything to do with Rose and it makes sense, I may end up putting her line back in as setup for that. But as things are, I feel better about the line being removed.