Your v0 project looks incredible — but it's a beautiful shell

v0 is fundamentally a UI generation tool, and understanding this explains every problem you're hitting. It excels at producing visually polished React components using shadcn/ui and Tailwind — because that's what it was trained to do. But it models applications as a collection of visual states, not as systems with data flow, persistence, and business logic. When you ask v0 for a 'dashboard with user analytics,' you get a gorgeous dashboard with realistic-looking but completely static numbers. The charts render, the tables paginate, the filters animate — all powered by a `const mockData` array at the top of the file.

The component architecture v0 produces is the second major issue. Each generation is self-contained — v0 creates components that carry their own state, their own mock data, and their own styling. When you try to compose them into an actual application, nothing communicates. The sidebar filter doesn't update the main content area. The modal form doesn't persist to a database. The notification bell doesn't connect to any event system. You have twenty beautiful components that each work in isolation and none of them work together.

v0 also generates exclusively client-side code, even when you're working in Next.js where server components are the default. Every component is marked `'use client'`, state lives in `useState` hooks instead of being fetched server-side, and there's no concept of server actions or API routes. This means even if you connect a database, you'd be exposing credentials to the browser or making unnecessary round trips through client-side fetching for data that should be server-rendered.