Что сказать
«Everything Server Component by default — server only, zero JS, await data, read secrets. 'use client' только state, effects, handlers. Key: 'use client' — boundary где client bundle begins — всё imported below bundled. Push to leaves — single button; data-heavy tree server. Composition: client can't import server, but children prop — client wrapper renders server content без bundle. Props serializable across boundary.»
Итог
RSC pitch: server default + leaf client + children composition + serializable props.
Next.js · middle · сложность 5