[igrigorik]

FWIW, think of SSR and RSC as complimentary. A tour that explores this: https://shopify.engineering/high-performance-hydrogen-powere...

The key to unlocking fast first-render is combination of streaming SSR (i.e. streaming HTML instead of just JS blobs), which is enabled by adopting Suspense (i.e. async the data fetch and stream data when available in HTML response, which then hydrates relevant component). RSC layers on top: it establishes a clear boundary between client and server logic, which enables better bundling strategies (as you highlighted), but also per-component and efficient subtree updates for subsequent interactions.

RSC is early but we've been working with the React core team on our use case and, based on the past few months of work and progress, we feel pretty confident about the direction. In particular, shifting legacy React apps towards Suspense+RSC will be a big shift for many, but we don't have that constraint.. We have the "luxury" of starting anew and we're leaning into the bleeding edge because it enables all the right primitives for commerce: fast first render, efficient updates, open space for optimizing bundles and RSC transport protocol, etc.