Just to address an issue I haven’t seen brought up yet: if theoretically polygamy would be reinstated, is it clear that both wives would live in the same house?
It’s one thing for two wives to agree to share one husband; that has its own challenges.
But why would the women agree to share a same house?
I would expect that each wife would want to have her own house to raise her kids, with the husband going back and forth.
There’s a reason co-wives are called צרות we assume they don’t like each other.
If this is true, then the finances get much harder.