How mahabarta called an dynamic text?

When we discussed something as dynamic it should be understood that something has not remained stagnant, or it should be understood that with the main narrative there was addition of other narratives into the main body making it richer with the passing of time.

As we can see that the growth of the Mahabharata did not stop with the Sanskrit version. Over the centuries, versions of the epic were written in a variety of languages through an ongoing process of dialogue between peoples, communities, and those who wrote the texts. Several stories that originated in specific regions or circulated amongst certain people found their way into the epic. At the same time, the central story of the epic was often retold in different ways. And episodes were depicted in sculpture and painting. They also provided themes for a wide range of performing arts – plays, dance and other kinds of narrations.
It is also believed that many Didactic in the text were later additions, making it on the one point story for someone and on the other hand for someone a tool to control people.