It gives voice to the people who doubt this is actually going anywhere, and it gives voice to the people who think it is. It also lays out the documented lies they've been telling the public, congress, and law enforcement over a 20 month period.
Link: https://www.washingtonpost.com/politics/trump-advisers-lied-over-and-over-again-mueller-says-the-question-is-why/2019/01/26/e72454f6-20c5-11e9-8e21-59a09ff1e2a1_story.html?utm_term=.03d28312efc5