[cemerick]

Hi, author here.

(Somewhat standardized) interfaces are _fine_. My contention is that you can have an interface shared by disparate actors without the problematical bits of "APIs" (both in spirit and in their particular current best materializations), which provide no useful data model constraints, do not acknowledge the realities of the network, and inherently couple client and server.

The point is that you can have a shared "interface" over _data_, in exactly the same way as producers and consumers share shapes/types of messages routed via queues — except that there are ways (CRDTs being one) to extend that dynamic so that data can be replicated along any topology, and shared and reacted to by N actors, not just a consumer downstream of your producer.

I hope that clarifies. :-)