These days tailwind is often paired with a component abstraction system that takes place of css classes as an abstraction system. Component abstraction achieves an even more powerful separation of semantics from styling, compare:

    <h1 class=hero>Cool page</h1>

vs:

    <Hero>Cool page</Hero>

In both cases you need to go find the “hero” abstraction, but in component world we are also abstracting over the HTML tag name in addition to whatever styling stuff.

When it comes to defining the “stylistic detail” in either case, it has been separated from the “content” which is our page source file. I am happy to pay a build step to get better separation of concerns - content from presentation.