The author may be right to argue that cursive has no decisive advantage over block letters, "so why teach it?", a more fundamental question to my mind is why bother teaching _both_ forms of hand-writing? If we have to pick one, why privilege block letters over cursive, if both are equally effective?
Edit: anecdotally, I write cursive cyrillic faster than I write block letter English, and Russian isn't even my native language.