[Barrin92]

">The UNIX philosophy is also build on the idea of small programs, just like micro-libraries, of doing one thing and one thing well, and composing those things to make larger things."

The Unix philosophy is also built on willful neglect of systems thinking. The complexity of system isn't in the complexity of its parts but in the complexity of the interaction of its parts.

Putting ten micro-libraries together, even if each is simple, doesn't mean you have a simple program, in fact it doesn't even mean you have a working program, because that depends entirely on how your libraries play together. When you implement the content of micro-libraries yourself you have to be at the very least conscious not just of what, but how your code works, and that's a good first defense against putting parts together that don't fit.

[ristos]

It's not a willful neglect of systems thinking. Functional programmers have been able to build very large programs made primarily of pure functions that are composed together. And it makes it much easier to debug as well, because everything is self-contained and you can easily decompose parts of the program. Same with the effectful code as well, leveraging things like algebraic effects.