The benefit you get from Social Security is that if you retire before you die, if a spouse or parent who provides your family income retires or dies before you die, or if you become too disabled to work, you don't have to worry about outliving your savings, and you don't have to worry about inflation making your annuity worthless.
Both of the problems could easily be solved by replacing SS with an ordinary savings account. Not to mention that Fed loans to SS aggravates inflation greatly.
An "ordinary savings account" can't give you a stream of income for the rest of your life that adjusts for inflation, even if you have to retire early due to disability, regardless of the state of the stock market or interest rates.
And right now, Social Security loans money to the rest of the government, not vice versa.
