I say this as a long time Svelte fan, and maintained some libraries for past 7 years: I really don't like the DX of "runes". What I liked about Svelte was the two way and automatic reactivity, clever computed values prefixed with $:, etc. The code looked simple and clean.
I know there's very good reasons for the changes, but it feels so similar to React (and even hooks) now that I don't see any big positives to using Svelte vs just using React. Sorry Rich.