In a static directory, adding a member adds one entry. In a GNN-backed network, adding a Fellow changes the embedding space. The new Fellow's semantic profile interacts with every existing profile, altering the distances between them. Some existing connections strengthen (the new Fellow sits between two clusters, bridging them). Some weaken (the new Fellow's profile shifts the semantic centre of gravity, making previously close Fellows slightly less similar in the new embedding). The whole cluster reforms around the new member.
This is why RSA Connect is not a directory with a search engine on top. It is a living graph whose topology changes with every addition, every interaction, every prediction error. The intelligence is in the reformation, not the addition.