Shtell > I assume the gedolim knew a little bit better .. It is well known that after they cancelled bein hazmanim because of the yom kippur war, that was the worst winter zman for many of the bnei torah.
This is unclear – are you claiming that gedolim know better because they are gedolim – but then how they made “the worst winter zman” in 1973? Or you are saying that gedolim know better because they absorbed experience of 1973? (the latter corresponds to Bava Basra description of creating a school system through “trial and error”).