People have quite different emotional reactions when dealing with money. DH has no trouble managing hundreds of thousands of dollars in terms of work-related budgets, but has 2 reactions about our home finances: benign indifference (if broad goals are being met); or anxiety and frustration if he is forced to think too much about small financial details. He feels that focusing on small details is not an optimal use of his time and energy (esp if I am willing to do it). Also, he grew up poor, and thinking too much about money beyond being happy the bills are paid causes him to channel early life anxiety OR to get angry that on his very good salary he still needs to sweat a purchase.
Now, if DH were not generally a frugal person, these traits could be a problem. Or if I were a similar person. Or if we didn't share long term goals. But we do share goals, and I have no problems dealing with our home finances. So what we do is:
1. Have a monthly meeting, about 10 minutes, where I give him a spreadsheet of our accounts and progress, and we discuss any upcoming large expenses such as vacations, cars, home repairs, etc.
2. If I want to experiment with e.g., optimizing groceries, I've accepted that I need to take that on, and not bother him with discussion of it unless he is violating my experiment with unusual and expensive food purchases.
3. He knows that we should think about and discuss large purchases like cars, and he will put time and effort into that without complaint, as long as I don't constantly bug him about small stuff.
It works fine. As long as one of you isn't spendy, and both of you know where the accounts are, and you both share the same goals, I wouldn't sweat the tiny details. Not everyone is wired to care about them.