Hot Take: Tailwind 4.0 Is Worse Than UnoCSS 0.60 for 2026 React 19 Design Systems The utility-first CSS landscape is shifting rapidly as we approach 2026, with React 19’s concurrent rendering, Server Components, and streaming architecture pushing frontend tooling to its limits. While Tailwind 4.0 was marketed as a major upgrade with improved JIT performance and expanded theming, early benchmarks and real-world testing for enterprise design systems reveal UnoCSS 0.60 is the far better fit for modern React workflows. Build Performance: UnoCSS Leaves Tailwind in the Dust For large-scale design systems with 500+ components, build speed is non-negotiable. Tailwind 4.0’s updated JIT engine still requires full project file scanning to detect class usage, adding 1.2–1.8 seconds to cold builds for React 19 projects and introducing 200–300ms latency on hot reloads for complex component trees.…