I write vanilla CSS in 2020, but I suspect you're right in a "most people" sense. Still, I'm biased toward longer-lived approaches, meaning that whenever I can make it practical, I try to build with vanilla HTML, CSS, & JS with as few other technologies & libs as I practically can. Even my final HTML tends to be quite human-readable.

Again, this won't work for many projects, but the point of it is long-term maintainability. I assume that most of what is built into major, recent browsers will have the longevity of bottled wine, while technologies outside the browser will be more like fresh grapes. If I want the site itself to be more like the wine than the grapes, doing something with it years from now shouldn't require a tool that no one has used for years.