> the need for getters and setters when using $runes in functions; this is a waste of time and almost always unnecessary in the contexts in which one uses small store classes

Yes, but then you can just use a class.

> using folders for routing and using standard page.svelte.js and server.svelte.js naming for everything

This wasn’t introduced with Svelte 5, this is SvelteKit.

> Despite all this, Svelte 5 introduces $writable

No it doesn’t? Do you mean $state()?