[tel]

It avoids intermediate structure and enables more sources and sinks to work. For instance, if you build a reducer, you're basically adjoining a "reducible" and a "reduction function" and then transforming the reducer by transforming that reduction function.

This already avoids the creation of intermediate structure since you just keep transforming the reduction function, but you have this sort of useless "reducible" thing attached. Mostly, the trouble is that you were afflicted by the kingdom of nouns---you don't really need a structure to think of first class objects.

Instead, you can just consider the various ways of transforming reduction functions. They all compose as (reverse) functions (you can see them as a category) and you can take your resultant "transducer" and apply it to a source and sink structure to map out of the source and into the sink.