Most of those tools are focused on giving you a full SPA on the client (and therefore load a lot of JS). Astro is focused on sites that are mostly static with "

Most of those tools are focused on giving you a full SPA on the client (and therefore load a lot of JS). Astro is focused on sites that are mostly static with "islands" of interactivity. To that end every component is server rendered only, by default, and you opt-in to client render when you need it (with different loading strategies).