I probably only use 1 % of Astro's features, but I like how it's enabled me to build static sides as back in the days, but with a build pipeline.

So I can use components, reuse stuff, include stuff etc, basically what I would do with PHP back in the days, but now it spits out a compiled page I can host for cheap (often even free). And easy to add in some interactivity when needed. Like I render a list as a component, and very easy to ship some dynamic filtering on the frontend using the same code, but the content is still statically in the html, so served fast and good SEO.