Picture this scenario. You have a serious accident, are admitted in some hosi and are in a coma. Meanwhile you bank account is bulging with money your wife cannot access to pay for your treatment or take care of your kids.
God forbid that you should pass away and no one nows where you squirrel away your monies or where you bought that ka plot or.... Picture your kids begging while some of your wealth which could have helped them is either rotting away somewhere, or a bank is making millions from your deposits which your family either knows nothing about, or cannot access Etc. This is an extreme illustration no doubt, but I hope you get the point. There is absolutely no wisdom in this. I share full financial details with my spouse bila issues.
Great men are not always wise, neither do the aged understand judgement...