Not quite the same, but I find "data-oriented programming" to be a very strong method for managing large codebases. By that I mean having data structures that d

Not quite the same, but I find "data-oriented programming" to be a very strong method for managing large codebases. By that I mean having data structures that designate the end state that you want, having another set of code that gets you to those end states, and maintaining a pretty clear boundary between the two. (If you like with "Functional Core, Imperative Shell", this is a way to further divide the Functional Core.) It works well because it narrows the surface area of a lot of possible bugs: either your configuration is wrong, or your code doing the transformations is wrong.