This is the complete opposite of what good CSS is supposed to be. The class name is supposed to tell you what it is not how it looks like. Anyone remember CSS Zen Garden?
The "good CSS" you're talking about was always the product of convention, and it was never sustainable for big, long-term projects. The CSS Zen Garden showcase only made sense in a world where everyone shared the same document or document structure. Those insane stylesheets depended on the source HTML document's inherent structure, which is the exact opposite of separation of concerns.
Inexperienced developers always underestimated the complexity they were adding to their project by using overly abstract classes and hidden structures between the DOM and the stylesheets. Tailwind (or any reasonable CSS methodology even) recognizes these problems and solves them.
I completely disagree. Look at (old) Reddit which allows for individual styling of each subreddit, or VSCode which allows themes to restyle the editor, as examples of real world products separating style from structure to huge success.
Not everything needs that level of separation, but to say that even basic separation is a problem to be solved by jamming everything into the class list is completely wrong.
