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.