The "use client" Tax

Why React Server Components force small interactive ideas into file-sized boundaries — and why that boundary should be lexical instead. There is a moment that every developer who tries React Server Components hits, usually within their first hour. They write a server component. It fetches some data. It renders a list. Beautiful. Then they want a button that toggles a filter, and the compiler stops them: "you can't use useState here." So they cut the interactive piece out, paste it into a new fil