Then it feels like we're just back to writing normal CSS classes.
Then I also have to write our own classes for modals, cards, toasts, lists, media objects, drop down menus, side menus, breadcrumbs, buttons, forms, their labels, images and their captions, and get the right mix of responsive utility classes as well so they all play nice together.
I'd rather just pick a framework that lets me customize the corner radii, padding, margins, and be done with it.