@liaizon I absolutely agree. I think the client-first development environment for ATProto makes this kind of work extremely emergent.
As @tsyesika said at FOSDEM in the Social Web Devroom, the ActivityPub social API ("C2S") is our equivalent to this programming interface. We need to get it kickstarted so we can build interesting social networking applications without having to build the server side, delivery, queuing, etc.