CSS, and styling pages in general, has always been a mess. Either have a disaster trying to name all your classes, or abuse HTML by using a billion utility classes a la Tailwind.

In my book this is not a problem inherent to CSS but, well, how to name classes and stuff in your HTML. At this very moment writing CSS is just amazing and many of its "new" features are what many of us have dreamed about for years.

Still I have another unpopular (and for many of you, stupid) opinion: I'd like it if HTML, CSS and JavaScript had all the same syntax. Like QML's.