The passage from the Talmud Sotah 21a beautifully illustrates how the Issachar-Zevulun agreement was practiced by prominent Tannaim. The example of Shimon ben Azariah and his brother Azariah showcases the dedication to Torah study facilitated by mutual support. 
Similarly, Rabbi Yochanan from the House of the Nasi exemplifies how communal support enabled Torah study while still acknowledging the importance of personal engagement in Torah learning.
Igrot Moshe's note emphasizes that even those who support others financially in their Torah study are not completely exempt from their own obligation to study Torah. During their free time, they are still required to engage in Torah study to the best of their ability.This concept underscores the balance between supporting communal Torah study and maintaining personal commitment to learning.