while i have only ever worked at places that do some form of agile development, sometimes i think about things that are just foundational elements. to be pedantic, they definitely work. they just, on their own, do not provide any utility. just a means to facilitate things to be constructed later on in development.
in particular i think of Black Triangles https://rampantgames.com/blog/?p=7745 which has been discussed here previously.