It's the lowest hill in the range of CSS frameworks, it's not reaching the heights of proper semantic CSS, but the valleys of haphazard, unsystematic style attributes are an even lower point.
What do you mean by "proper" and "semantic?" The CSS spec never took much of an opinion on how classes should be organized or mapped to elements in the DOM. It's a technical standard. The way people used to write high-abstraction CSS was completely a cultural convention that, in hindsight, overstayed its welcome.
