I just saw their recent update and it's quite impressive. Not the biggest fan of Tailwind but it definitely seems to make svelte development faster and less painful (not that it's any more painful than it should be).
Having used tailwind a little bit, I have nothing but praise for it. Effortless copy/pasting of components with confidence, really nice look by default, easy tweaking, absolutely no management or planning required to organize your CSS, and it's all right there, directly on your html, never anywhere you have to hunt for it. Feels very freeing to just... not think about CSS at all.
And the "clutter" really is fine, modern IDEs with good syntax highlighting, plus a tailwind extension to help complete the class names and clean up accidental duplicates or conflicting properties, and you're good.