Such narrowness is a צרה not only because that Hebrew word comes from the root צר, meaning narrow (as in מקום צר, a narrow place). It is a צרה because eagerly awaiting visit and exploration are a land mass of twenty four sacred books, כ"ד ספרים, of תורה שבכתב, as well as a sea of talmud (ים התלמוד), positioned around six Mishnaic orders (ששה סדרי משנה), with thousands of pages for the Jewish man to traverse, along with many more treasures and adventures (such as deep sea Talmudic diving, inspecting sunken ships of the past, and prospecting for hidden valuables) beyond. And if some stay in a safe harbor of a selected few pages, rather than visiting the great expanses beyond, they will miss out on worlds, and not be able to ascend to the higher ranks of captains and commanders in the Torah realm.
Correcting a serious misconception
Some people mistakenly believe that the Litvishe tradition of Torah study does not esteem or demand broad based Torah knowledge (aka בקיאות). That notion, however, is emphatically not correct, and needs to be strongly refuted, which ב"ה it was recently, in a featured excerpt of a sefer in a widely distributed newspaper (the Flatbush Jewish Journal, a publication out of NY), citing the leading Litvak sages Rav Avraham Pam zt"l, and Rav Elazar Menachem Man Schach zt"l.
The greatly revered and loved Rosh Yeshiva of Yeshiva Torah Vodaas, Rav Avraham Pam zt"l, was known as a mild mannered man, and a great baal middos (of exemplary character and conduct). He was not a person who was seeking to criticize others, particularly students of Torah, who were so beloved to him. But he did, nevertheless, feel compelled to speak out strongly (in his soft-spoken way) against the problem (among some) of narrowness in scope of Torah study, echoing the great Rav Elazar Menachem Man Schach zt"l.
Both of those towering Litvishe Torah authorities, by the way, were old school Litvaks, the real McCoy, so to speak, not some synthetic modern hybrid versions. Rav Pam, despite his American citizenship, was a genuine Litvak, born in the Eastern European homeland of Litvishe Yidden, who studied Torah in Kovno, Lithuania, as well as being a close talmid of Rav Dovid Leibowitz, great-nephew of the Chofetz Chaim, and founder of ישיבת רבינו ישראל מאיר הכהן, after migrating to the USA. Rav Schach as well, despite his many decades in Eretz Yisroel, was at his root, also a Litvak from Jewish Lithuania.
The relevant segment can be seen in the feature "A Vort from Rav Pam" (from the great sefer by that name) starting on P.4 of the FJJ issue of this past parshas Vayeilech, and continuing and concluding on p. 82 there.
May we merit Torah broadness in the path of our great gedolim.
P.S. The Sukkos edition of Yated Ne'eman of NY, has a precious interview with Maran Rav Shmuel Kamenetsky shlit"a (by Avrohom Birnbaum), in which this topic is touched upon. It says there that in the early days of Lakewood, the (BMG) Rosh Yeshiva went away to Eretz Yisroel during the winter one year, and came back after after Purim, whereupon he gave a shiur on daf nun zayin (דף נז) of the מסכת. They had learned - and during first seder yet (so I asssumed - but perhaps lav davka) - from the beginning of the mesechta until daf 57. רב שמואל שליט"א is then asked, what happened, why yeshivos cover less ground now? The response given is twofold. One, that when Mirrer talmidim came from Shanghai, things slowed down, as they were used to learning slower than than the Kletzker Rosh Yeshiva, and two, that there were very few seforim (on gemara) in Lakewood in those days to distract them, so they were able to plow ahead and proceed veiter.