ok, functionally kind of like Shadow DOM, but requires a compile step (which interacts with other compile steps and libraries in different ways I guess), and re-invents all the shadow DOM facilities like referencing local elements but with those x-dimensional provisos.
In my opinion, all of these things exist because CSS is confusing to people, not because anything is inherently better. This is especially true with modern build tools. CSS modules and Atomic CSS seem like a regression to me, but not all needs are the same.