You don't know the half. Having seen these arrangements up close for over a decade now, let me say that any benefits are more than offset by the constant meddling of relatives in matters which in the Anglo culture would have nothing to do with them.
One example from where I live: the norm here is for a married couple to move into the same house or compound with the groom's parents.
One charming outcomes of this arrangement is that in addition to whatever issues of domestic friction exist between a couple, the new bride is very often emotionally and physically abused by her husband's mother and female relatives who expect her to function as a servant.
Imagine the fun, gents, of your mother/aunts/older sisters beating your wife. While happy relations between all parties can exist, there are more than enough of these instances for this to be a traditionally "accepted" source of domestic violence regionally.
