Unlike other products, a big part of this game goes well beyond what you can put in a PDF—all the components and secrets in the game are physical. However, the game does come with a PDF of important setting and rules information for easy electronic searches (this PDF is not intended for an initial read-through, but rather to be used as a handy reference tool).
Also, it's worth noting that the Developmental Mode is designed so that it requires nothing but the app (or the Sooth Deck). The rest of the game is designed around the other cool components to help convey the difference between the modes. So play at the table revolves around the components—the cards, the Testament of Suns, the Path of Suns, the tokens, and so on. They aren’t “extraneous” in the Action or Narrative Modes.