That is the reason.Mahabharata is with 9verse.Basically it is a dialogue between Arjuna and Lord Krishnaa. It is a human psychology. You cannot have the mind the complete human psychology because it is independent. You cannot cover the whole human psychology in 660 pages.You cannot .Human psychology is much beyond it.And it is still evolving.That is the reason Sanatana Dharama does not have the end.It is evolving day by day.
