Simply put: your state exists on each client and the mechanism to reconcile that state across clients is not mission critical. Almost all apps currently are built to get their state from a centralized, remote location. This is easy to build but is fragile and not forgiving for loss of network connection.

CRDTs and local-first ideals means putting the client in charge of its state which leads to all these positive side effects: virtually instant UX interactions, privacy (your not sending data necessarily to a central server, and even if you are it could just be opaque, encrypted blobs that are proxied), network-agnostic syncing (email, bluetooth, internet, wifi, etc) and no fears of a service completely going out of business and losing your data.