The original title of Schopenhauer's “Art of Controversy” could be more accurately translated as “The Art of being always Right” (Die Kunst, Recht zu behalten). The reason why he described those stratagems was to prove his point: that the goal of a controversy is not finding the truth. According to him, it was like a fight where you just want to win.
PG advocates for controversies that help find the truth. Thus he makes a difference between fallacies and real arguments. To Schopenhauer, real arguments are actually fallacies, because mere humans have other goals than the truth. Ironically, in http://www.paulgraham.com/philosophy.html, PG followed Wittgenstein in that “most philosophical controversies are due to confusions over language”. In a philosophical context, at least, this should lead to a similar conclusion as Schopenhauer's.
Now, whether the case of philosophy should be extended to the rest of controversies is an interesting question. My answer would be yes. I wonder what PG would say. The fun part is that, whatever he says, Schopenhauer will still be right (look: he doesn't care of the truth, he just wants to win the argument!). That's the whole fun of controversies about controversy...