I don't understand the title here in relation to the rest of the article. The author seems to be arguing that recursion should be easily understood, and the fac

I don't understand the title here in relation to the rest of the article. The author seems to be arguing that recursion should be easily understood, and the fact that students find it challenging must be the teachers' fault because the author has no problem with it. But they never get around to explaining how to teach it better, so why do they say we should cease labeling it as challenging?