@ RGPANSN
“Chazal have used the criteria of “go and see what Yidden have been doing” to decide halacha.”
True that
The criteria has extended into Shulchan Aruch and Nosei Keilim to include even a minhag noshim (who might not be as learned as men)
Right, when their custom was upheld by the Rebbonim.
It is Chazal, the Rishonim, the Shulchan Aruch and Gedolai Haposkim we rely on who upheld the custom in question and it is on them we are relying.
You are trying to apply these principles to justify new beliefs and practices that all the Gedolei HaRabbonim who have weighed in on the matter opposed.
Furthermore you stated that reason / shikul hada’at is not relevant to making the determination when in fact it is very much the shikul hada’at of Gedolei HaRabbonim we rely on in determining what minchag to accept and what to be doche b’ shtei yedayim.
Cheers