There's no excuse for a dedicated blog to have 4 stylesheets, sure. But this is a subpage of a big website. The stylesheets are based on logical separation, with more sheets getting added in as you go to more specialized pages. On the frontpage, which is really more of our focus, there's a single CSS file.

CSS doesn't get anywhere near as much benefit from being minified as JS does. There's much less scope for transformation of the code to make it smaller, so if you're serving your CSS gzipped (which we do) then the difference is minimal at best.

You're right about them not being minified, but wrong about the need for 4 external stylesheets.

Look at their home page, for example. It uses just one stylesheet (v6core.css). That same file is also used on their blog, so my browser already has it cached. Perfect!

None of those stylesheets are less than 45K, so the savings they get from not needing to download them on every page outweighs the HTTP request hit they take by including them separately on more complex pages.