Institutionalized marriage is only natural to human society when our economic base requires it.
That’s the ancient part of the marriage history.
We are, however, living in a MODERN one.
Apart from the social and cultural inertia of existing marriage system, the economic premise of a marriage is vanishing.
First, the individual production unit of a modern economy is a factory, firm or enterprise, not a family.
Second, human physical labor is replaced by machines since the industrial revolution; We mainly need human mental labor now, on which women don’t necessarily differ from men.