US life expectancy is down 1.8 years

Think of the money we'll save when all those unvaxxed conservatives die before they reach SS age.

Not before bankrupting the estate of the person in question.

Do you think defined benefit plans are more sustainable than defined contribution plans?

Good question. I’m not sure which is better; however, I feel certain Congress will select which ever one benefits corporations and the wealthy most.

I agree 100%, which is why I'm a big proponent of public campaign financing and proportional ranked choice voting (creating a multi-party system that would be harder for corporations to completely capture -- it's too easy for them when there's only two). What are your thoughts on addressing corporatism?

Well, if you like those ideas, the Brennan Center is a good resource on small-donor public financing. The Clean Money movement has a similar idea. FairVote is a great advocate for proportional representation (PR) and Ranked Choice Voting, and Lee Drutman is starting a movement more focused on PR:

https://www.fixourhouse.org/

In regards to defined benefit versus defined contribution, I'd suggest looking at the history of pension plans that used those models to see which ones were more sustainable.