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Or for a serious stack like Phoenix Liveview.

Liveview is neat, but it still has quite some raw edges - and it’s not really meant for SSG which is the topic at hand

So Astro, then. I was was replying to the previous poster who did need a real app.

I'd love to hear your ideas about what makes TanStack Start less "serious" than Astro

Tanstack vs Phoenix, not Astro. Astro is for static sites. JavaScript is not a serious backend language, but Tanstack SPA isn’t half bad.