It is not about having infinite width and depth of knowledge. Is about abstracting at the right level for the components are relevant enough and can assume correctness outside the focus of what you are solving.

Systems include people, that make their own decisions that affect how they work and we don’t go down to biology and chemistry to understand how they make choices. But that doesn’t mean that people decisions should be fully ignored in our analysis, just that there is a right abstraction level for that.

And sometimes a side or abstracted component deserves to be seen or understood with more detail because some of the sub components or its fine behavior makes a difference for what we are solving. Can we do that?