YYA > your profound השגה of ‘Emes of Torah’,
There is nothing profound here. This is direct from or direct implication from what the founders and current leaders say. The goal (and a very worthy one) is to protect the public. Protection means keeping separate from things that might be dangerous. This is part of the approach and we see here how this is applied to any topic: college/army/non-Jews/leaving yeshiva/zionists … There is a lot of good reasons for that. But it implies that every Talmid Chacham that disagrees is called an apikoires, because otherwise students might get wrong ideas in their head. And, again, you see it here – these negative opinions are not simply out of ignorance, they are being taught in order to protect the students.
R Salanter was wondering about the same. He admired, I think, R Hildesheimer Torah class in Germany that was attended by women but said – if I try something like that in Lita, I’ll be kicked out. So, that idea had to wait for Ms Schenirer to adopt from German Jews.