The same people looking and working on the CSS are the same people looking and working on the HTML. HTML full of long complex class names is a bit harder to grok.
I actually prefer nice semantic HTML but I admit that's not always possible.
> HTML full of long complex class names is a bit harder to grok.
I wouldn't recommend long and complex names either, but with something like tachyons, they're not long or complex, there are simply long lists of orthogonal classes.