I built myself a SSG for React based on Vite as a build plugin. It is very simple, fits in one file, and the dev experience is almost exactly like having React Router but with SSG built in. Once a user configures the build plugin there's nothing left to worry about besides building a classic React website.
I had a great experience with using Hugo to set up a relatively complex multilang website with a lot of custom advanced workflows.
The twist is, OpenAI Codex did all the setup. I described precisely what I wanted in natural language. Codex did a perfect job.