The author makes the point that Scala (like VB) counts on libraries to abstract away its complexities in hopes of gaining widespread appeal. He also observes that tends to lead to a cast system in the programmers that use the language that is not productive.
I’ve seen this type of thinking before. A few years ago I had a bout of insanity and lead an ASP.NET project using ASP.NET 2.0. I had no .NET experience prior to this project. The project failed, although the reasons for that failure are legion and unimportant here. But I noticed something about ASP.NET developers: they have no clue how the technology works.