Why track DMM progress? Let me illustrate.
I come from a city in America called Minneapolis. It has many beautiful lakes. We like to rent canoes and go boating on them. I learned something about canoeing. Keeping my eyes fixed on the other side of the lake matters. Otherwise, it is easy to paddle around on the lake for hours without actually crossing it.
Some people engage in disciple-making efforts without tracking their progress. They are a bit like me on the lake. They take their eyes off their goal.