For me TailwindCSS actually was helpful in learning CSS. You still apply the same core CSS fundamentals. If you created a complex layout in Tailwind, you can also do it in normal CSS. I look up the exact rules behind their classes frequently in their docs.
If you just copy classes and don't care to understand them, it's a different story of course.
If you just copy classes and don't care to understand them, it's a different story of course.