Remember history also provides credible data on various subjects. Yes, at times like the ancient history of the period of Ramayan and Mahabharat, exact or approximate dates are not known, but even then the other information and the details would be extremely useful for humanity.
Mahabharat did, however, caused massive destruction, destroyed the entire civilized life as existed then, and almost brought the world back to the Stone Age. Sad but interesting and requires in-depth study for the future of humanity.
But to do that we need to ensure that Ramayan and Mahabharat, as ancient history, reach the universities. This is a MUST and an important step for future survival of humanity.