Tokens (color, type, spacing), components with all their states built in, patterns (forms, tables, flows), and the usage guidance that prevents drift — code and Figma as one source of truth.
Consistency across modules built years apart by different teams, accessibility solved once, and feature velocity rising as the component coverage grows — infrastructure economics, not aesthetics.
A product suite needs governance and versioning; a single app needs a disciplined component library — the system should be one size smaller than ambition suggests, then grow on demand.
Ownership named, contribution process defined, drift audited — unmaintained systems decay into the inconsistency they were built to prevent.
Skipping the discipline this article describes until an incident, audit, or stalled project forces it — every practice above is cheaper adopted early than retrofitted under pressure.
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