On the emotional side of maintaining finances if both are wage earners (it is not about how you keep it, single, joint, blah, blah, blah), the person who can manage finances better should handle that part of it and the person who controls expenses better should handle that part of it. If it is the same person, so be it. Simultaneously, the person maintaining/controlling should also help/guide the other person the nuances and the reasons. God forbid, if a disaster happens either one of them should know what to do and what state the family's finances are.
Key part is as long as one does not discuss that it is my money, it is fine. The entire earnings should be it is our money. Also, one should never bring up that they make the bigger share. Always calculate expenses and savings from an unified earnings.