I love svelte too, but I would argue that the way svelte extends JavaScript by making reactivity a language primitive pushes svelte beyond "the old web, just better".

https://gist.github.com/Rich-Harris/0f910048478c2a6505d1c321...

https://svelte.dev/docs/svelte-components#script-3-$-marks-a...

https://svelte.dev/docs/svelte-components#script-4-prefix-st...