[Griever]

Great question. We rarely rely on shared utility classes these days. Historically we'd end up going the @apply route, but lately we just add a new style to the root-level css file and call it a day. We may prefix it with "@layer" so that it gets tree-shaken, but that's about it.

I've found that in component-driven UI, the need for these kinds of utility classes becomes less and less necessary. The utility CSS may be defined in the component, and the component is ultimately what gets reused.

Could you elaborate more on the reason for your interest? I've used Tailwind to implement several well-defined design languages, and always had great success. In fact, compared to other design systems, Material for example, I found it to be far simpler to manage over time.