As fun as it is playing as Hyrule's version of David Attenborough, what benefits does having a complete compendium give, aside from allowing more precise tracking?
1 Answer
According to a lot of sites (ZeldaInformer for example), completing the compendium unlocks a dialogue with Symin at the Ancient Tech Lab.
He then gives you a 'Classified Envelope' with 'a picture of a beautiful young woman of the Sheikah tribe in it.'
No one knows what it is used for right now, but some expect it to be useful in a future DLC.