> But at this point we lose decorativeness. I don't understand this sentence. The left-recursive rules are pretty much standard. Many parse algorithms deal wit

> But at this point we lose decorativeness. I don't understand this sentence. The left-recursive rules are pretty much standard. Many parse algorithms deal with such left-recursive rules well; you can feed such rules directly to e.g. Earley parser and it will work correctly without producing ambiguous parses. And of course as the author says they capture precedence well. So what is this lack of decorativeness that makes it non-ideal? Decorate what?