That is what lots of actor frameworks are trying, first specify a DAG of tranformations and then instantiate that graph on a physical network of computers such

That is what lots of actor frameworks are trying, first specify a DAG of tranformations and then instantiate that graph on a physical network of computers such that the async boundaries can be scaled independently. It's cumbersome, like writing the same program squared just to get scaling for "free". Personally I think the Persistency-as-a-library and Consistency-as-a-library architecture is a saner alternative.