Thank you for sharing this insight. I agree completely that many acting in Rome's name (those invoking the so-called spirit of the Second Vatican Council come to mind) ignore or trash Tradition. But this is not what Fellay said. He is saying that Rome needs to be taught Tradition's raison d'etre. What does the Society teach is Tradition's raison d'etre?
"What does the Society teach is Tradition's raison d'etre?"
I'm afraid I don't know.