L’kula, is the minimum standard of halachic chiuyv. it IS the halacha that Hashem gave us. He also gave rabbonim the power to pasken, and they often pasken far more than is required by the perfect halacha that we were already given. we make a choice to be more strict, or follow the given halacha.
I source, please? I do not believe this is true.
(IIRC) We have a system of P’sak. B’shaas H’Dichak, one can “rely” on a kula (a shitta that is not paskened by) due to it being better to the alternative (such as hefsed meruba, for example). That is not the Halacha that should be followed in the normal case.