Unless you include saving on bank fees, I've never seen the real advantage of having a joint bank account. And personally, I'd rather spend the $4 (or whatever amount it is I pay each month to keep my cheque account operating) rather than submit to the claustrophobia I imagine accompanies the holding of a joint account.
I subscribe to the principle that both my spending and my earnings are mainly my business. Despite nineteen years of marriage, our household finances resemble more those of flatmates than spouses. I earn my income and pay my bills. My husband earns his income and pays his bills. As the main income earner he pays the majority of the household bills too but if we make an especially large joint purchase we occasionally go halves. I'm guessing that's an unusual arrangement but then I've nothing to compare it to.
When we got married we each had a job as well as many years of independence and financial self-sufficiency under our belts. Marriage didn't herald a change in our financial situation or our working circumstances and so opening a joint account simply didn't enter our minds. It was business as usual as far as earning and paying the mortgage and bills were concerned.
A friend once said to me that her mother told her from hard experience that there's nothing more demeaning than having to beg your husband for money to buy tampons. Painting as it does a picture of a grim life in which a woman has relinquished total economic power to a man, it's a comment I've never forgotten.
Perhaps I've subconsciously held close the idea that as long as I'm in charge of my own finances I'll never need to ask anyone for money for anything. And I have this impression that possessing a joint account obliges each holder to have purchases authorised by the other party but that may be a false assumption.