The fashion industry is the best analogy I've seen so far for frontend frameworks. It's obvious that the amount of technical rigor involved with declaring something "content-driven" and "server-first" is approximately zero.
Astro is trying to position itself in opposition to things like Next.js or Nuxt wich are specifically marketed as application frameworks?
And the architecture is more suited to something like a content site, because of the content collections, built-in MDX support, SSR, image handling, and server routing?
What do you mean when you say "a content site"?
To me, "content" == "literally anything that resides in the DOM".
But, clearly we aren't talking about that (I hope).