The most common failure mode in design systems work is building for the wrong audience. A system built to satisfy the design team will frustrate engineers. A system built only for engineering efficiency will be ignored by designers who find it too rigid. The best systems are built for the product — for the user — and treat both disciplines as equal contributors.
Brad Frost's Atomic Design gave us a vocabulary: atoms, molecules, organisms, templates, pages. But the metaphor matters less than the principle it encodes: components are compositions, and composition must be deliberate. Every component you add to a system is a commitment to maintain, document, and evolve. Restraint is a feature.
A design system is not finished when it is launched — it is alive when it is used. The real signal of a healthy system is not the number of components but the quality of the contribution model: who can propose changes, how decisions are made, and how the system evolves with the product it serves.