I have gone back to plain CSS files and dropping Sass and other preprocessing techniques just because the past decade of managing build chains and dependencies

I have gone back to plain CSS files and dropping Sass and other preprocessing techniques just because the past decade of managing build chains and dependencies to marginally improve writing styles that change minimally between redesigns has soured me on more complex build processes. By the time you actually do a redesign that would take advantage of the fact you use mixins, css variables, etc., the whole design language changes, and meanwhile you'll have to change preprocessors anyways.