🤖 Next.js 16 Upgrade: 50% Faster Builds, But i18n Routes Turned to 404 Dust One dev's brutal upgrade from Next.js 14 to 16: Turbopack delivers speed, React 19 shines, but middleware deprecation sparks chaos. Worth it? Data says yes — with caveats. 4 min read 3 weeks, 6 days ago