This reminds me of one topic that I learned during my engineering days in the high school. It is called indigenous technology. The concept of indigenous technology is the ability to solve problems with the technology that is known to people of that environment. The problem could be universal but every culture or nationality has their own way of serving that particular problem. The method that is being applied by your grandmother and mother could be peculiar to people in that environment as at that time. When you go to another country that could be another means they serve money and gold then. But later on the universal method of using the bank that is being controlled by the government became invoke whereby everybody willingly and forcefully has to trust the government to save their fund and other valuables. Presently wise people are looking for a way to avoid the bank and the highly centralized government and become their own banks by adopting a decentralized means of owning and managing money which is Bitcoin. So, instead of looking back to ages to adopt the methods they were using then, it could be better to look at the future to adopt the method that will be invoked in the nearest future.