The problem is that often while regular users are not directly using those features, they are using libraries that do use them. As a concrete example, people wr

The problem is that often while regular users are not directly using those features, they are using libraries that do use them. As a concrete example, people writing webapps with Django probably (often) aren't using some of the crazier class metaprogramming, but they are using Django's models, which use lots of it.