Thought-provoking write-up. One part of this is the "meaning of human life". Part of that for me is: humans are the only known lifeform that can look at the stars and try to understand. And, to the best of our understanding, this ability arose from winning a billion biological lotteries, from the blind system of nature and natural selection which by complete coincidence, stumbled on intelligence as a beneficial trait…
But evolution doesn't make those developments improbable or coincidental. I recently read a book called Time's Second Arrow about how selection, when present in systems that can create many combinations, naturally evolve more functional information, which is the number of bits it takes to identify specific combinations that are (in a certain contexts) more functional. (log base 2 of the number of possible combination…
So, why are you not enslaved by your lizard overlords? 8) Homo is a bit of a johnny come lately and yet has managed to travel to the moon and back.
We only have a single extant example of hom sap to work with. We can work backwards, within reason, and still not manage to come up with a completely satisfying origin story. There is no way you can "derive" hom sap from first principles.