I kind of see the utility in prevailing in the universe can much more be an active and guided persuasion through us humans (maybe by proxy, through whatever robotic arks we can come up with), because it can be so much more effective than a passive and kind of brittle and to me unconvincing process of post-solar system panspermia.
You may have a bias towards humans but nature doesn't care: all the bets are played in parallel.
In fact by your own preference, the unicellular organisms are more likely to successfully spread their DNA (as it's "packetized" into a complete organism) via the surfaces of the robot ships you describe than the multicellular ones are.
Gumby is right here. While it's obviously important to US whether or not we survive, Mother Nature doesn't care whether we live or die.
As long as the genes keep propagating, she's good.
I think it's healthy for humans to look to their own survival, but I realize that Mother Nature only cares for the propagation of genes. We should never confuse the one with the other. We should never start to believe that Mother Nature has an interest in our survival more than the survival of some other fish, or alien lifeform far away, or some bacteria, or virus. That could be a fatal mistake for us.
I would take it further and say that nature doesn't care about genes either. Caring is a property of whole organisms with complex information processing abilities. Genes kinda tend to propagate, just because the ones that were slightly less good at that didn't make it very far.
That’s up to you — I also think spaceships are great (and also don’t really see the point of putting humans in them). We’re all just telling you that nature doesn’t prefer you or me to the amoeba, nor vice versa.
