A “discreet” defense of Amoris Laetitia?

Why should such an important question, relating to the doctrines of marriage, the Eucharist and confession, in apparent contradiction to existing teaching, be dealt with “in a discreet way”? How can the papal magisterium, addressed by its very nature to the entire Church and the world, be “discreetly” exercised? And what does “discreet” even mean in the context of a papal document highly anticipated on a controverted question?