Rich Harris has this "stick it to the man" attitude which I thoroughly enjoy. In his case "The Man" is React and Vue. He shows some back and forth between himself, Evan You and Dan Abramov in one of his videos. Evan You called it SvelteScript in not a good way. This is all part of the competitive fun.

My biggest beef with Rich Harris is that he doesn't credit Lars Bak and the small team at Google for doing incredible work speeding up V8. Google saw nodejs take off and realized they had to make V8 faster, so they put a lot of money into doing so. Unfortunately the virtual DOM took off before V8 got super fast. Look up "you don't need a virtual DOM" for confirmation.

I believe it's one of the reasons Microsoft threw in the towel and adopted Blink. If you can't beat 'em, join 'em.

Harris also doesn't give any credit to the reactive binding work that came before him. He acts like he used a spreadsheet and had the bright idea to make a website that way. I have a strong sense of fairness so I don't think a designer/dev working for newspapers should take the credit from the geniuses at Google who made it possible. I think it's quite possible that he doesn't know any computer science but he's a gifted amateur.

Im looking at Shadow DOM components myself, but it's quite possible I might use Svelte. It's a nice tool, but it's not the magic beans that solve all your problems like no one ever before.