Why were Scotism and Thomism called the old way of medieval philosophy?

In the late 14th century, the philosophical systems of Thomism—the teachings of St. Thomas Aquinas—and Scotism—the work of John Duns Scotus—were collectively designated as the "old way" (via antiqua) of philosophizing.1

This label was applied in contrast to the "modern way" (via moderna), a movement initiated by thinkers such as William of Ockham. While Thomism and Scotism were established schools that had formalized earlier medieval ways of philosophizing, the via moderna introduced new approaches to theology and philosophy that challenged the traditional reliance on the existence of universal natures or essences.12

By grouping Thomism and Scotism together as the via antiqua, later medieval scholars distinguished these established, realist-leaning systems from the nominalist and skeptical tendencies that characterized the via moderna and its emphasis on the absolute freedom of God and the individuality of creatures.1