But how many use _just_ React now? There is a whole stack that 90% of YC companies use: Node, pnpm, Next, React, doing SSR by default. Idk about it all. Most of the time when I ask why they do SSR they can't tell me a valid reason. Their bundle sizes are so big for what the apps do.

Didn't React 19 introduce a compiler in an attempt to provide auto-memoization? That feels pretty substantial.

Are you ignoring signals? Signals are a pretty huge evolution.

Nobody uses plain reactjs anymore.