Ok, but if even metzitzah is a shailah, it’s ultimately a decision based on Torah values, not on what society considers moral.
I’m not sure of that. Part of the reasoning behind the Cherem of Rabbainu Gershom at that time (it is said, I don’t have the source off the top of my head) was because of of the Catholic Sacrement of Marriage, making Bigamy a sin in their eyes. So too here, if Metziza becomes an societal issue with the general public (which B”H it has not), that would be a consideration.
Even L’Shitascha, how much weight to give to “studies” and Nistar is subjective as well (similar to the case of Runia, which was all Halachic and nothing societal, but nonetheless was morally ambiguous).