This trend has grown in response to how difficult it is to avoid regressions at scale - large or multiple projects, lots of components, lots of independent teams, etc.

The cascade really is an elegant and efficient idea but it becomes really difficult to manage as projects grow.

The different with inline CSS is that those helpers are the building blocks — that’s where your standardize your design system metrics.

As others have pointed out this library provides a mechanism to abstract into components as well.