Ujm, I will admit that there’s a difference between an adult being in a mixed environment where socializing is avoidable; much like many workplaces. many good jews went to Brooklyn college and held their nose; they came for what they needed and left. High school is a different story; almost nobody who went is saved from sin. It’s the formative years when hormones are raging and socializing is a huge part of the school life.
Avi, it was a typo, i fixed it.
I don’t believe the story about the brisker rov and chazon ish. Where did you see it/hear it from? Briskers keep a very clear log of stories; if such a thing happened, i would have heard it (the other half of my rebbeim are briskers). Not only do they record stories meticulously, my rosh yeshiva says that rav berel, when saying a story, would use the same exact words with the same exact inflection every single time. If one time he used a different word, the talmidim would discuss it!
You left out other dinim which support the mitzvah of yishuv EY, including a spouse being able to force the other to move there. Rav Moshes peshara is said in many achronim to answer these contradictions. Worth noting that some rishonim don’t hold of these dinim(or many of them), there’s tosfos, rabbeinu chananel, etc.
The megilas esther writes that the rambam didn’t hold it’s a chiyuv. Assur latzeis is a gemara. Different din altogether; it’s not an obligation to go and live there, but if you’re there, you’re not allowed to leave, because it’s disrespecting the opportunity Hashem gave to you too be mekayam mitzvos and be in the paltrin shel melech. Or because of Rav Moshes pshat. Either way achronim assume that the rambam held it’s not a chiyuv.