On inter-island communication, I actually think less is more – I find a lot of the recent big features like this they have added unnecessarily constrain you to doing things a certain way, while the reason I liked Astro in the first place was the simplicity.

You can easily add any global store library to your project to communicate between islands from the very simple (nanostores) to more complex stuff (are people still using mobx, redux, etc?)

I actually would prefer if Astro kept the core more simple, I never understood the point of Astro components for example; always thought their game plan would be to build their own client-side framework like what remix v3 is doing, but currently their components are too limited to make them worth using over just doing everything in react, svelte, or whatever floats your boat.

Astro component is your page's entry point. It's similar to React server component. The typical flow is to fetch data in it, and pass the data to client component written in React or whatever. You can also have pages that are Astro only, without any front-end framework.