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.