You might be right. But the idea of 401ks was probably particularly alien.One quibble - were pensions really the norm when SS was created in the 40s? I think most of those pensions were installed in the 50s, when unionization really took off.
Before the 40s, the US had a much larger agrarian population and small business - they had no pension.
In fact the reason FDR created SS was because most people had NO retirement plan.
It needs updated for our current world. There's no doubt in that.