Joseph
1. I know my customers I can supply the actual text of the ban saying it and it wouldn’t be authoritative enough if it didn’t fit with what you want to be true. (We all know of your strange obsession with polygamy)
2. I don’t understand what you are saying. At one point hakacha allowed two wives. Then it didn’t. Whether you call it halacha/minhag/geder/gezeira isn’t reallyrelevent.
If in fact it was done to suit “western sensitivites” (for which I do have sources but I will have to find them, and as I said I don’t expect you to like them), it certainly is an example of the subject at hand.
I am not saying it is EXACTLY the same., I’m not sure how you made that mistake.