Indeed saving money in bank preserves our money for us. But the issue with keeping your money in the bank is that you are hardly getting anything. Staking can be more profitable and risky at the same time. You can make good profit from staking your cryptocurrency, and even more as the true value of the asset you have staked continues to increase. But when that is not the case, it would be the opposite which is a loss due to the true value of the asset you are holding decreasing.
But, majority of the people would always prefer to stake their money than just leaving it in the bank and making nothing. Although as usual you will always need to have some part of it saved in the Bank, while another part can go for staking or whatever you choose.
For me the essence of saving money in the bank is for savings only that you can have the opportunity to withdraw it anytime your money is needed but if you are putting your money in a system and hoping for it to grow then staking is the best option. In my case I didn't put my money more on a bank if I know that I would keep it here for a three months or more because if I put it on staking within this expand of time there will be the probability to grow.