Having many students improves the quality of the Torah study, facilitating our ability to better understand the reasons for the Mitzvoth that we study. Creating fences around the Torah is especially important for the laws about which we lack any understanding. The Rabbis want to lead us to perfection by focusing on improving an element at one extreme, then on the opposite extreme, and finally focusing on perfect balance in the middle. The Maharal discusses the importance of the center, balancing extremes, in many places. Each one had a unique characteristic with which he endowed the Jewish people.
Precision is the only way it can work.
Yes, I am aware of the desire to prefer compromise. This last point needs elaboration, and I will look for an opportunity to do so. Rather, from within a Torah perspective it is required, to ensure proper clarification of the Torah, making it more than just a voluntary protection of the Torah. So it lies between a logically compelling act and a purely voluntary one. This pattern of three is also consistent with the division of the Torah into chukim, mishpatim, and mitzvoth.