Popa,
I have not read R’ Lichtenstein’s work. However, it seems to me that this might be a valid basis for requiring stronger more universal Torah learning for women. As an analogy, in the past Torah education wasn’t common among the masses for older teenagers and 20somethings. Today it is sacrosanct. I wonder if the reason is the sense that the outside world is ever more tempting and to combat the modern Yetzer Horah ever more Torah is needed.
Maybe it was the lack of advanced Torah institutions that allowed for the spiritual devastation wrought be Haskalah/Communism/ Zionism.
I can hear a strong argument that the more involved in the secular world Jews are, the more intense their Torah learning must be. Because the “Centrist Orthodox” as a matter of principle want great involvement in the outside world, correspondingly, their girls must learn Torah in greater depth, including learning Gemara.