It's true that banks don't keep 100% of our money, they only keep 10-20% of our money, the rest they turn over or owe to other people. That's why if we want to withdraw all our money from the bank, it takes a week or more because the bank provides the money. First of all, that's the level of bullshit from banks. If one country withdraws all the money that is in the bank, the bank will be overwhelmed and go bankrupt. Many big banks have gone bankrupt. So be smart or look for assets to save your money so you can maintain your wealth.
If you want to store wealth and keep it safe in terms of its value and also physically, of course the wiser choice is in certain assets such as gold and land and other assets too. Meanwhile, at the bank it is only used as temporary storage before we use it again for everything we need because in this day and age, almost everyone probably really needs the services available through the bank for the smooth running of business and other things.
And also other things that can make it easier for everyone when they want to spend something in large amounts or when they want to send large amounts of money to certain places that we need. So it is clear in this case that the bank is not a place to store money forever except only temporarily as a bridge to get to another place.