It's because women evolved to pick mates who acquire the most resources, but until very, very recently, "resources" meant "stuff". The caveman would bring home meat and pelts. The farmer would have acres of crops. The soldier would have medals. The carpenter would build tangible objects.

Being a modern man means that your primary - if not sole - acquisition is a number in a bank account. It's not something easily registered as a thing. Big number is good, yes, but it doesn't activate the same pathways as actually watching your man create something of value, because we didn't evolve to associate numbers with prosperity. That's something that needs to be learned. Until then, their subconscious tells them every day that you've come back empty-handed, which obviously means you weren't doing anything all day.

This is also why the trope of "wife spends all of husband's money on dumb shit" is so prevalent. Converting the Prosperity Number into objects fills that gap. It's no longer just a number, but a thing she owns.

If she's at least somewhat intelligent, she'll attribute her ownership of that thing to you. A lot of women miss this step and start believing that because they're the ones who bought it, they're the ones who earned it. This is why there are so many broke, useless women who are, regardless, massively entitled. They take money from their dad/boyfriend/beta orbiter/whatever, convert it into objects, then look at their collection of objects and think "look at all the stuff I have, I don't need no man".