The use of a World Café conversation among employees (and even stakeholders) strengthens community building throughout an organization.
Even the authors of the Agile Manifesto state that "The most efficient and effective method of conveying information to and within a development team is FACE-TO-FACE conversation." :-)
Bringing employees and stakeholders together in a large scale conversation not only busts silos between departments but also encourages them to co-create new solutions together. The rich spectrum of ideas which emerge from a World Café conversation is a reflection of the diversity of experience and know-how of the participants.
Take a look at a case study which successfully tapped into the collective wisdom of an entire region: https://www.worldcafe.eu/en/metropolregion-nuremberg/