i am not sure whether my psoting was sent…i clikced the wrong button…
anyway- notpashut, I will comment very briefly on yoru posting.
(BTW- I dont’ get my head bitten off too often)
You are right in saying that some of the kullos in the past were because of hardship. The best example is when ‘hefsed merubah’ is quoted. However, there are many instances when hardhsip is still present. It is very difficult for women with children to stay home all shabbos. This is a very acceptable reason why to institute an eiruv. There are others too-like making sure that no one is mechalel shabbos inadvertently. All these reasons are present today too.
It would be easy to unscrew the bottle tops before shabbos and you are welcome to do this but if one has not done so, there is a good reason to rely upon r’sholom zalman’s psak.It is thirst.
My point is that the search for kullos is a very legitimate way to pasken halochos, even today.For the klal, this is most evident,even if the jochid can do what he wants for himself, as many gedolim have done.
I still disagree with you on the meaning of ‘koach dehetaira odif”. Rashi makes it clear that the reason for this is because you need BETTER reasons to be “mattir”. By hence, it is more correct than to be machmir. By definition, it is easier to say no. Anway- as you say- this will be an ongoing debate.