I don't think the example compares. In languages like JS, double, triple or even further nested ternaries are possible. But terser isn't always better because human readability is important. I can easily understood your SASS example because I know SASS, but I'd never write it like that. If I really wanted to add a decedent selector from a body class to .class1, I'd start a new nest on the body tag.

The problem with Tailwind is there's nothing you can do to avoid the much more difficult to scan and understand syntax described above. I personally don't understand why people are drinking this koolaide. I really think this is a fad a lot of people are going to come to regret when they go back to maintain older projects based on it.