alt Hacker NewsThis definitely does fill a gap that Rails has. I love using it but man I can't make a nice looking front end to save my life. We've used Tailwind UI a ton but thats kind of a foot gun because you end up slightly tweaking classes all over the place if you're not disciplined.
I've fiddled with Open Props [0] a bit lately, seems like a nice middle ground! Colours/fonts/spacing/etc that look nice together are there, but it's still up to you to use them. (And you're still writing CSS, so might be a deal breaker if that's the part of tailwind you like... but CSS is rather nice nowadays.)
[0] https://open-props.style/