Slightly off topic but the keeping finances separate seems like so much work. I can see dividing big, regular things like the mortgage but if you have an inequality in incomes constantly trying to figure out who pays what and if someone is owed money seems like a giant PIA. With a family tons of little things come up like needing new Christmas lights, dog needs a haircut, gift for the kid's teacher or a field trip, water bill is higher than normal, etc. I just can't wrap my mind around constantly figuring out who's paying for what, etc. Sounds like a big headache.
Our paycheques go into a joint account and we just share it all.
I guess it just depends on what you are used to, having always had separate finances (together 14 years married 9), to me, it feels like it basically takes no effort. We hardly ever discuss finances, and have never once had a disagreement about finances. He has the bills he pays, and I have the bills I pay, we don't try to make things exactly equal, or even exact reflections of the % that each of us brings in, so no one ever owes the other money. We discuss if one of us feels like we are cutting it too close with expenses vs income, but that happens very rarely, for instance I paid for a large pool equipment upgrade this summer that ended up being twice as costly as I thought it would be, I told DH that I might need him to cover more incidentals on an upcoming trip that I originally booked and planned on paying for, but prior to that I can't remember the last time we changed things up. I pay for all of the household incidentals, so if the water bill is higher than expected, or we have an extra vet trip than we had planned on that's on me, if I feel like I am cutting it close that month we will talk about it, but it really very rarely ever happens. Some years I probably pay out more than would be my 'fair' share (based on percentages of income brought in) and some years he probably pays more, but we don't think about it that way.
That said, I think if asked we would both say that we feel like all of the money is 'our' money, we just each handle the part that we bring in independently. Even though I said that I consider DH's bonus his, I also know that if I told him I needed it for something he would have no issue with me spending it.
Different things work for different people, I can't imagine having truly pooled money, or discussing a $100 expense with DH, but that certainly works very well for others.