I mentioned some of this in another comment in this thread[^1], but CSS has gotten tremendously better since Sass was first introduced in the 00s. Many features we used are now native to CSS, and can be used in your browser, today. Some of them are even better than their sass variants, or at least have special abilities sass doesn't. calc() comes to mind, as it can mix and match units in a way a preprocessor just cant. You can do calc(100% - 10px), which is good for all sorts of stupid corner cases.

And native CSS nesting is basically 1:1 with how Sass does it:

.parent {
  font-weight: 600;

  &:hover {
    background: purple;
  }

  .child {
    font-weight: 900;
  }

  @media screen and (max-width: 800px) {
    display: none;
  }
}

I still use Sass or Stylus[^2] on virtually all of my projects, but its nice to not have to when you just need to get something out or write a userstyle or something.

[^1]: Not sure how to provide an instance agnostic link, the few things I've seen people attempt didn't work, but here's the lemdro.id link [^2]: I'm largely giving up on Stylus, its sadly unmaintained. My favorite preprocessor though; takes .sass (indented) style to a whole new level on what you can omit