I know, although I am not married but still I know because I have seen many real-life events where wives and GFs are after the money of their men therefore they should not show off until they can manage to lose it all or half. The best practice is to stay on the safer side and the only way is to not share your overall assets to anyone but you know in modern cultures wives also earn money and if they are not sharing what they have then you should not.
It is very sensitive matter though, and many men will say sharing is good, but IMO it is not, and there is not point in getting the information out from your partner that what he own, as if that's was not the main reason you chose them.
It doesn't matter if you're single, married or divorced, but you're correct. We don't have to experience it in order to know it, like why we avoid to eat shit while we never eat shit in our life?
The only know if your wife or girlfriend has a good money management is, you give like 50%-70% of your money for her, then ask her how much her money after a year, three years, 5 years and 10 years.
If her money keep growing, she has a good money management and vice versa.
Then you can try to act if you're bankrupt or get fired from your company, which you not generate a good amount of money and it force her to use her savings. If she don't mind to use her savings to live with you, I would say that man is already won in his life.
Lets say that you are still on that girlfriend/boyfriend period, are you that willing to give out that kindof 70-80% of your money on this situation just to prove out that she's worthy or having that good money management? I doubt that men would be doing that. Yes, its hard to detect or know a particular women on what her ability when it comes to management on which usually when we are still that dependent into our parents at that time then we arent that minding that much since we dont have any responsibilities behind on which most likely you do able to see that they will be prioritizing first on what she interested into rather than on saving it up. Somehow there are those individuals that being a business minded person on early years or in your relationship period on which this shows that she had really that potential if ever you two ended up on being married. Its up to us on how we do try out to find those qualities of the girl we do love, but having those kind of set up on trying out to give almost 100% of your money, nah,, its an impossible thing to be done by someon.