The "good architecture" there is to begin by making things general and then build specialisation on top of that. This is essentially what the author was saying.

The "good architecture" there is to begin by making things general and then build specialisation on top of that. This is essentially what the author was saying. At that point its an implementation detail if you have your CSS in one file or many. I think what the author is talking about is when you choose a module structure that is orthogonal to that. That is the square peg that he is referring to, by my interpretation.