It's clear you operate in a lower income bracket.
Most high wage earners will have individual accounts.
There is nothing in a commitment issue with it.
Most don't remain married forever, when that separation happens any joint account is up for grabs for whoever gets their first.
Good luck hiring an attorney for this if you have no cash to do so. They don't work except for a direct retainer in divorces.
I agree. It's not about commitment at all. It's about ease of management and communication. If you don't want to have to discuss every charge, deal with cash collisions(2 people overdrawing an account) and get the third degree, it's easier to have 2 accounts and manage your own pool of resources.
My wife paid her student loans off in a few years and I paid the mortage and living expenses while she focused on that. We're still keeping things separate now and she's handling childcare expenses, car payment and savings (trying to catch up to me).
Everyone needs to find what works for them and decide what they feel comfortable with. Everyone's income and expenses are going to be different. In a single income family, it might as well be joint....but trust is key in any relationship.
I'm the loose canon when it comes to spending money in my household, but only because I am efficient at saving when I want to. I'll cook cheap meals for weeks, buy things I'd need to buy anyway at 50% off....calculate the savings and then buy a bottle of scotch to celebrate.