MDD, your seifa erases your reisha. The shiur of talmud Tora is keriat shema twice daily (Menachot 99b). In fact, Hashem aslos cries on one who canot learn but learns Netziv says (Heemek Devar Devarim 10:12) that diferent people have different jobs in Olam HaZeh. Some must devote their lives to learning, others to public service, others to regular jobs. A person who is in one group is almost forbidden to do the job of someone in another group. How does one know? By trial and error. If he learns for a while in high school and sees that he does not have what it takes or if he needs to do other things as well he should not go into yeshiva gedola.He is not only wasting himself and not doing his personal job but also wasting resources that could go for those who have futures as talmidei chachamim.
Choppy, Shammai lived during the time when EY had a puppet government – which had an army. Rashbi lived under an occupier and would have been very happy with an army that would have been able to throw them out (see Shabbat 33b after he left the cave for the second time). The Rambam, the Chatam Sofer and the Chafetz Chaim lived in Galut and relied on Goyish armies (although the CC advocated military service so that Jews would know what to do when we got our own state).