Well without knowing the people involved in that decision and their personalities, it seems a tough question to answer. But I don't see it as a foretelling a divorce, I see it as a way to have some control of your own money.
My wife and I each have a separate account, and a joint account. We have split the bills and each contribute a set amount into the joint account to pay those bills. We also have a joint credit card we charge everything to (dinner, groceries, etc) and at the end of the month we split that bill and pay out of our individual accounts.
I then have 'my' money and she has 'her' money to do as we each wish. My wife loves jewelry, and I enjoy buying shop equipment, etc. I find it somewhat satisfying that when my wife takes me out for say my birthday it is with 'her' money and she is actually treating me and when I do it to her it is the same. It has more meaning somehow for me that way---I have done it reverse and it seems that in essence you are taking yourself out for dinner!
Now of course it is all in how you look at it--but that is how we look at it and this system works for us. To each their own.
As long as we have enough to pay our bills each month, the remainder gets spent per however I or my wife wishes. This works very well for us--she doesn't feel I am trying to control her money and I feel the same way. It works very well for our personalities--but I can certainly see it not working for everyone. But my wife and I are very good communicators and I don't see any divorce on the horizon