[Standard] Sideboard guides, pros and cons

Hey all,

I am playing in RC Cincinnati this weekend and I'm still relatively new to competitive magic at this level, and I'm just curious as I've seen some people swear by sideboard guides, but I don't understand the point of them. I understand the deck I'm playing, and its weaknesses and how my sideboard affects the deck vs. a large swath of meta decks.

I guess the discussion I want to have is what is the point of a sideboard guide? Is it more for players who are unfamiliar with the deck or the meta as a whole? What are the merits to using sideboard guides, and what can they provide?