[gaius]

How about: bad ideas get to remain in power for much longer, because the generations of administrators/voters/executives that enforce them don't turn over.

But also: you can have people with literally double or more experience, working on your hard problems. You also have a government that will look out much further into the future, because they will see the outcomes themselves.

[closeparen]

Sure, but. Look at the state of the world 600 years ago, and imagine that the people at the helm were starting to hand over power just now.

I think the world would look a lot more like it did 600 years ago. Perhaps more moral by some standards, but probably also unable to replicate a technological breakthrough like the eradication of aging.