Dear Syag,
Of course a line could be drawn separating chabad’s practices from everyone else. But that does not prove a thing. Is a repeating line the actual line that separates the permissible than the forbidden? If someone responds “Absolutely!”, that seems awfully convenient to me. And if it’s not the separating line, than why does anyone care how they pray? What’s in their heads when they say these things, is their business. I’m surprised by your stance here.