That's an interesting viewpoint. Assuming that the money received from SS represents an equal amount of money that was left invested in Vanguards index 500 fund, the growth of that money from 3 years ago is compounded at close to 15% per year. A mite higher than the growth in SS payment.
But that's an obviously false comparison. You are comparing a retrospective investment return (cherry-picked both to exclude a balanced portfolio by way and to skip over the crash!) to an insurance product that protects you with an income that you can't outlive. It is always the case with insurance products that there is a near-term disadvantage, particularly against cherry-picked stock market return. The benefit of insurance appears when the risk that you cannot afford to bear actually appears, i.e. unexpectedly long life,
If your comparison period included the past five years, compared to a balanced portfolio, reflected the ~8% increase due to Delayed Retirement Credits PLUS the COLAs for the five year period (since you are using nominal returns for the S&P, and you live 5 years more than you expect, what do you think the comparison would look like?