I think the reason why tailwind is as popular as it is, is because it really ties in with the "change something, save, then immediately see the result" loop and dx of modern day web development.

Yes, this works with regular css too but it's the fact that you can do bigger changes inline quickly without making up a class (and god forbid you already have a different class affecting the same element and it gets hairy). Personally I think this is nice, it's great to immediately see results and then adjust. But dx is not the only thing that matters and there are tradeoffs too. Personally I would use tailwind for personal projects but I don't think I would try to introduce it at work.