Marriage is not just the sum of it's accrued assets the law does not care about the acquiring of the assets when it divides them, nor should it. It's about the equal contribution to the
marriage, which is a unique institution with it's own history that predates both law and governments that make laws.
The law wisely chooses to not quantify the non-monetary value a wife brings to the marriage, it absolutely does not want to get into the business of putting a value on getting and bringing forth of legitimate children.