Nope, it never did traditionally, not in Somali culture or Arab culture.traditionally this is how it works, but there is no quranic requirement that child care can't be shared among wives. the practice needs to adapt to the times...
in only works in your own teenage fantasies.
The Sharia fiqh of women having their own accommodation goes back a thousand yrs, but we have little Farax with a whole lot of fantasies saying otherwise.