Without a centralized system, products accumulate 'UI debt'—hundreds of rogue CSS classes, conflicting button paddings, and arbitrary modal implementations.
When an accessibility auditor or security requirement demands a global fix (e.g. updating input contrast or touch target sizing), a design system allows the fix to be authored once in the component library and distributed everywhere with a single package update.
Additionally, comprehensive documentation dramatically accelerates developer and designer onboarding, helping new hires ship production-ready interfaces within their first week.
Level 1 · Understanding Design Systems