Astro is a whole different thing really. I don't think vite-plugin-ssr users would want to use Astro and also vice-versa to some degree.

Hmm. It seems like the big differences between the two are:

1) Astro is either all-SSG or all-SSR, while VPS is mix-and-match

2) Astro uses `.astro` templates by default, while VPS uses `.js` by default

3) Astro comes out-of-the-box with Typescript, Sass, etc., while VPS requires more configuration (by design)

Other than that, they seem to have fairly similar project structures and use-cases... Or am I misunderstanding?

VPS is tailored for users who like/want/need control. If you care about control, Astro isn't a good fit. E.g. you won't be able to use Astro with React Server Components. And many other subtleties that, in the end, sum up to a fundamentally different tool.