That's a financial arrangement more suitable for room-mates, in my opinion.
"For better or for worse - in sickness and in health - til death do we part."
That's what my wife and I both signed up for, twenty-five years ago. I knew what I was getting into, and so did she. We chose to be a family anyway, and it's worked out pretty well, despite the inevitable frictions.
That financial arrangement won’t work for everyone, I’m sure, but it has always worked for me and my spouse-it is a common one in my family, even though my ancestry is Hispanic-odd, I suppose but I was taught to be responsible for my own finances from childhood, as was my male sibling-my parents were very into that...
If circumstances had been different and my 1st hubby’s dad had not been a CPA, we would no doubt have had a joint household account-but I already had purchased a small house-with parental help-by 21, and had my own bank account, credit card, car paid for,etc. My hubby had his own vehicles and credit, too-but not a house, hence the separation of finances his dad helped us set up-we never, ever argued about money.
MrT5 and I each had all our own property from the gitgo-house, vehicles, etc-but the 1st time we acquired community property, we set up a separate household account to pay just for the community stuff-it worked for us-we never fought about money either and had 16 happy years until his untimely death...