It seems like adding new code as "Chapters," unless pursued with a bit of self-discipline, may result in spahgetti which is worse than a non-literate style.

Imagine a multi-person project where every little feature gets its own file, and now the programmer has to find the source of the bug between interacting blocks of in code fragments split across multiple files, ehich are combined together by tooling.... oh wait, I think that describes just about any sufficiently large C or C++ project.