Tradition (sampradayam) is a belief that is passed down from one to another in society and does not involve perpetuating own theories.
Notes:
Our Acarya who preaches about the principle, benefit and the goal do not float their theories but impart what has been traditionally passed down from their Acaryas. These form the tradition.
Nathamunigal, Bhagavad Ramanujar, Swami Desikan, had all preached whatever they have learned from their Acaryas. This is how it has been collectively formed as a tradition.
The meaning of Veda and Dharma sastra are complex by nature, it is very difficult for us to infer. One might even end up misinterpreting its meaning. So, it is always better to learn them through what has been passed down from the wise sages. It must be learned in a tradition-based manner to ensure the meanings are not lost.