Kind of weird way to put it. Turbopack was not a real product for years. It was forever stuck in weird beta/alpha stage and only recently went and became the default for NextJS.

Vite has been stable for years at least 5 years now and is built-upon because it's fast, stable, reliable and a bit less complicated than Webpack.

Thanks for the clarification.

Which is mainly NextJS (old and new), since under the hood that still seems to rely on Webpack.

Not really, because they only ported into Rust the most used plugins with "yes but" constraints.