What conceptual leap, defined by Brad Frost's work, crystalized the identity of the modern design system?

Answer

Shifting focus from designing static pages to designing the underlying, reusable systems.

Frost's contribution marked a shift from output-focused design (pages) to input-focused design (the reusable systems that build those pages).

What conceptual leap, defined by Brad Frost's work, crystalized the identity of the modern design system?
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