Owllake has pondered that disagreement between R' Solomon Breuer and R' Chaim Soloveitchik on the Agudas policy towards Zionism may have started off a kind of familial squabble that lived on in Washington Heights. I would hope that Hatfield and McCoy type hostility would not affect community policy.
Aaron Rakeffet tells the story of how R' Breuer was brought to the USA by Bernard Revel of YU and while appreciating that likely life saving gesture, R' Breuer was greatly displeased by what he observed on the campus, particularly the educational content in some of the classes. To me, this is the more likely explanation. YU housed one of the greatest collection of scholars in the world, in addition to Rabbi Soloveitchik. You'd think that the Breuer's yeshiva could have utilized this to attract students, rather than watch so many of its youth march off to Lakewood. I would argue that the Torah u'Maddah approach was not acceptable to R' Breuer and overtook any possible benefits from an educational association between the two places. I admit that this is conjecture.
Whatever the real story there, I still argue that a kind of separation, even if we don't call it Austritt, is necessary today and even to Orthodox groups. I thought of a metaphor to explain it. Remember Odysseus and the sirens from the Iliad? Here's how about.com describes the story:
A siren call means something that is alluring. It is dangerous and potentially deadly. Even if you know better, the siren call is hard to resist. In Greek mythology, the sirens who allured were sea nymphs beguiling enough to begin with, but with even more enticing voices.
In Odyssey Book XII Circe warns Odysseus about the dangers he will face at sea. One of these is the Sirens. In the adventure of the Argonauts, Jason and his men faced the danger of the Sirens with the help of the singing of Orpheus. Odysseus has no Orpheus to drown out the lovely voices, so he orders his men to stuff their ears with wax and tie him to a mast so he can't escape, but can still hear them singing.When a person opens his ears to the enticing voices of the larger world, he needs something to hold him back, lest he leap to his death in the sea. As I have written, the Chabad shliach is safe running a Chabad house in Madrid because his focus is exclusively on Chabad. His clothing, his look, his mindset is all Chabad, so he's not enticed by Madrid. The Torah Im Derech Eretz person is open to the good of Spanish culture, so he needs something to hold him back lest he get too drawn in as some groups in the Orthodox world do.