I think many programming languages fall into another category not mentioned in the article, a category where they serve both the beginner and the expert, but no

I think many programming languages fall into another category not mentioned in the article, a category where they serve both the beginner and the expert, but not the intermediate user. That is, they're fairly easy to pick up for a beginner, as there are tons of "hello world" tutorials and with all of the libraries and frameworks available can be used to make large production applications but moving from one to the other requires incredible amounts of work. That being said, I don't think many of the typical user interface guidelines apply to programming languages anyway, so the point is probably moot.