Its a known fact that marriages are made in heaven but end in courts.
In the case of matrimonial litigations, the point to think is "who gains ?", "Which family benefits ?", "Which law is intended to PRESERVE family system and harmony ?"
It is a fact that after the popularity of these 498 A and DV Act, even couples who had minor misunderstandings could not reconcile and both of them ruined their lives in courts for years. Even in the end, they separated. HAd they done that before, both would be happy married again by now with a more compatible spouse ?
When its a MCD, without any expectations from each other, no one keeps hard feelings about the other. If there is no attachment left, there would still not be any hatred between the couple. It has been observed that the couples who separate this way, at times even become friends later and even get married easily to the one they are compatible with. In such cases, the children enjoy the company of both mother and father as they are not instigated against either of the parent.
While in case of litigations, be it maintenance cases or DV Act or 498 A, the lives of the hubby and wife are ruined. No matter for some time the wife might feel empowered, but the society which knows that she had sent the in-laws to jail or troubled them with false cases, does not accept this woman so easily.
Ultimately what ? After years of litigations and troubling the in-laws in courts for years, what does the woman gain except money ? And who has been able to carry this money forward to the next birth ? Is this life not the only opportunity to live, work hard and die with respect ?
As we all know, there IS no law as yet to PRESERVE FAMILY harmony but there are loads to destroy the same ...
Now coming back to your question, well, laws, even according to the above, cannot improve matrimonial harmony.
The only way laws could improve matrimonial harmony, is by keeping away from the MATRIMONY :) :) :)