For awareness, if you want to build a SSG/SSR frontend, there's also [Astro](https://astro.build/)

It lets you ship client islands to the client, which AFAIK is essentially partial hydration.

You can make islands with pretty much any JS framework or even none e.g. Web Components

Katie Sylor-Miller named them when she was at Etsy and from memory they were React components in a PHP page to start