That means that SS is essentially pay we go. that works when there are 10 employees for every one retiree. But the demographics are such that that ratio will be coming down. Here is a chart showing the dramatic reduction in the worker to beneficiary ratio:
https://www.ssa.gov/history/ratios.html Once there are not enough funds taken in in any given year, because there are not enough employees per beneficiary, to meet payment obligations, then congress is going to have to use tax payments to make up the difference. When that happens, all bets are off. Means testing, and significant reductions in benefits are inevitable.
And, no, the retirement benefits are no where near as good as I could have done if I had invested in my own account. It's not even close.