"Less code" implies less authored code, which may be a benefit of Svelte (is it? I haven't been able to use it much but it's on my radar) but doesn't necessarily map to its technical goals (less built code, less runtime processing).
(Quick example: the countless hello world projects that result in >100KB bundles)
You're not just moving web dev in a better direction, but also fact and data based journalism and visualization! I first learned of Svelt and Rollup (and became your fan) when I asked how you made that great NYT article, The Follower Factory! I'm glad you've kept working on Svelt, and I can't wait to see what you do next.
or "Faster, smaller, web apps?"
They seem to be the main benefits for using Svelte.