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 for reproduction, and optimized for it to the point of creating sentience and free will.

It's this incredibly improbable event that I think gives humanity as a whole an obligation to try to understand and explore the universe. To not do so, I think would be a waste of this incredibly unlikely "gift". And that appears to require complexity in order to understand and explore.

Note I think this is an obligation of humanity, not necessarily every individual human. I think free will means individuals can choose not to.

The other part of this is complexity of modern society. I'm not certain whether all the elements of modern society are necessary for this overarching meaning, and pieces of it could potentially be reduced, but I think it would be tricky. Society begins whether you want it to or not as soon as you have more than one individual with free will, and some complexity arises inevitably. But haven't thought about this side as much; it's an interesting side of this discussion.