Even if it's going out as an irrelevance, even if it's concentrated in one scene, it's seldom simply tacked on. There is stuff before and after it, supporting it, that has to go. The whole architecutre and support of the story structure has to change.
Even it's so stunning superfluous that it could just be excised, the problem of flow remains. Every sentence in the tale needs to lead onto the next. Chunks vanishing will leave holes there if nowhere else. . . .