Given that the time it would take to “listen to all the arguments” it would require decades beyond what a seminarian is given the task to accomplish, the Angelic Doctor cannot possibly be talking about seminarians here, but rather professional philosophers who have the task of studying “all of the arguments”.
Can you imagine reading all of Descartes, Spinoza, Kant, Hegel, Marx, Schopenhauer, Kierkegaard, Nietzsche, Heidegger, Wittgenstein, Popper, Frege, Searle, Kant, Schopenhaer, Wittgenstein, Hume, Carlysle, Simpson Plato, Aristotle, Descartes, Spinoza, Kant, Hegel, Marx, Schopenhauer, Kierkegaard, Nietzsche, Heidegger, Wittgenstein, Popper, Frege, Searle, Foucault, Jaspers, Derrida … and more
and still have time to gain mastery in Thomism? (have you?)
Modern philosophy has to be summarized at the seminary level. Jesuits, perhaps, with their 15 years of preparation could handle a few of those in a comprehensive view.