Meteor's RPCs support automatic optimistic UI updates, where the same code can be used to update the client side data store and the server side database, result

Meteor's RPCs support automatic optimistic UI updates, where the same code can be used to update the client side data store and the server side database, resulting in the perception of zero latency between server and client. Building that functionality out yourself from scratch could be difficult, since all of the components of Meteor work together to make that experience possible.