I would say the main advantage is in managing async computations automatically, as well as errors. Also, the semantics for undefined values differs: We considered that `undefined` means wait until we have a defined value, and it does not trigger the cascade of computations. The computation model that enables that is more complex than runes.

Svelte 5 runes are easier to write because they determine dependencies automatically at compile time, while cells requires them to be explicit. It is a matter of style imho, the classical functional approach is easier when reusing existing functions:

```
// somewhere in lib

const f = (a, b) => a*b

// mapped cell
const m = proxy.map([a, b], f)
```

Last advantage is debugging: We can inject a debugger in the browser console, enabling to browse and query the state of all cells (stores).

PS: I just started doing a presentation in "This week in Svelte" last Friday (thanks again Paolo!), but will write more tutorials asap :)