The whole reason why women don’t is for women’s privacy and dignity so they don’t have to deal with jealousy and other unfair treatment.I meant in my previous post that you are correct about how it works traditionally. I am saying the practice could modernize so they can share a roof and thereby gain efficiencies in house work. If there is a hadeeth countering this i am open to hearing it. i am aware the wives of the prophet had their own abodes but did the prophet ever say it was impermissible to just allot each wife a different room in the same house?
The reason why I accuse you of peddling male fantasy is because what you’re suggesting goes against reality and what actually benefits women and you seem to forget the jealousy component. Women do not like sharing their husbands and If they are in that position, they’ll never want to live with the other women or have to deal with her or her kids. It is human nature 101.
About the impermissible part. One of the rights your wives have over you is that you provide them with their OWN lodging. Not doing do Is going against their right and no woman is going to accept you bringing another woman into her space. If you cannot afford separate houses with separate bills and life, polygamy is haram for you.
With regards to housework as a man you should help her and the woman has her own family that can help her with childcare. Any subsequent children and wives you have has nothing to do with your wives and she isn’t obliged to even talk to them let alone help. That is the Sharia.