The big ball of nouns

The code is not the whole story. Each piece of code has to operate on data, which tends to introduce a lot of coupling no matter the paradigm. Maciej argues that the issue stems not from code structure alone but from how data is organised and coupled throughout an application, and advocates shifting perspective toward behaviour-driven design — identifying stronger architectural boundaries, creating smaller and more isolated components, and drawing connections to Phoenix Contexts as a path to meaningful module boundaries.