ubiquitin: According to the quote from Rav Ahron it is abundantly clear he means “must”. The rest of the recording is only Rav Heinemann’s opinion.
benignuman: Unless you provide names of rabbonim, your definition of “yeshivish” vastly differs from the common definition. The only names you provided are those of unsourced and unwritten rulings that someone allegedly claims to have heard. And if, as you say, “when someone asks a personal shaila, the response is meant for him alone, not for publication unless the rov says so”, why then are you publishing these supposed shailas and alleged responses that you acknowledge were at most a one-off responsa that the rov didn’t want published or used generally by the public? As you say “Rabbonim are often reluctant to publish heterim because they do not trust that the heter won’t be misunderstood/extended”, why are you extending it where it is easily liable to be misunderstood as the rabbonim feared?
The mainstream view and psak, as abundantly demonstrated by numerous written psakim by the gedolei haposkim across the spectrum (yeshivish/litvish, chasidish and sefardish) is that it is prohibited to shake a woman’s hand in a business setting or otherwise. There may be any number of private heteirim to do any sort of aveiros the Torah might prohibit based on unique circumstances. But those heteirim in no way, shape or form indicate that the underlying aveira is anything other than prohibited. No less that when someone receives a heter to be mechallel Shabbos does it mean that chillul Shabbos is permitted. Or “mainstream”.
newbee: What if you have to physically pick a woman up and take her off the train tracks to save her life? Being permitted to do so demonstrates that other times you can pick a woman up if you feel it isn’t derech chiba? You’re arguing since you can carry her out of the pool so you should be able to carry her to a cot if she fell asleep on the kitchen floor if you believe it isn’t derech chiba for you.
And all doctors don’t shake hands. What on earth are you talking about?
Rav Moshe writes multiple times that shaking a woman’s hand is objectively derech chiba.