What is one benefit of internal storytelling?

Internal storytelling is also known as a framed narrative, which can further be thought of as a story within a story. Internal storytelling can provide context for the main story and provide some important background information that communicates rationale for certain things within a main story. Internal storytelling, additionally, can provide different points of view by having the internal story told from the perspective of another character, and one thing this does is grant the reader insights into cognitive workings of multiple characters that may have otherwise gone unknown, especially if the narrator is limited (as opposed to omniscient).