I was mostly thinking in the context of state governments in creating their existing multi-employer DB plans making that policy choice, but, yes, the Feds could also expand SS contribution and benefits to make it a universal first-line pension instead of a near-universal safety net pension.
An examples would be multi employer Teamsters truck driver pension plans, and they are notable because in a multi employer DB pension plan, when an employer goes bankrupt, the unfunded liabilities get distributed amongst the remaining employers. Which means once things start going downward, the longer you stay in, the more of the bag you are left holding.
Which precipitated the recent bailout of some multi employer pension plans, since they had enough political sway:
https://www.nytimes.com/2021/03/07/business/dealbook/bailout...