I’ve not used it in anger but the principle just seems like inline-styles with extra steps. However I’ve also had to change something in a large project that had a lot of dedicated classes with specific and shared styles and trying to sort that out without breaking stuff was a massive pain.

Oh look it’s chrome!

Right, but my point is that that wasn’t explained in the post, and it’s not the only thing in the article that is stated as “you should do this thing” without telling the reader why.

I wouldn’t call this “beginner” but some useful stuff nonetheless. Some of the points could use some justification or a reason to do it, eg using 127.1 over 127.0.0.1.