> But for very small very well contained libraries I would argue that they sometime _are_ done

https://en.wikipedia.org/wiki/Unix_philosophy#Do_One_Thing_a...

> As stated by McIlroy, and generally accepted throughout the Unix community, Unix programs have always been expected to follow the concept of DOTADIW, or "Do One Thing And Do It Well." There are limited sources for the acronym DOTADIW on the Internet, but it is discussed at length during the development and packaging of new operating systems, especially in the Linux community.