Theme bundles allow accessibility-critical styling—contrast ratios, focus indicators, motion preferences, and font scaling—to be defined once and applied everywhere. Fixes or improvements propagate automatically, ensuring consistent accessibility compliance without rewriting components.

When multiple applications consume the same components, a shared theme bundle guarantees consistent colors, spacing, typography, and interaction states everywhere. This consistency improves brand recognition, usability, and user trust while eliminating subtle visual drift between apps.

Theme bundles typically export static design tokens (such as CSS variables or simple objects), which avoids runtime logic, reduces bundle size, and supports tree-shaking. This makes theming effectively free from a performance perspective, even at large scale.