Where does it start? Ego builds the individual? Knowledge from an individual builds those around her?
After a few weeks of life, we start separating the world from the 'I'.
In our teen years we rebel. We say I am not a possession of anything or anyone. Our parents cringe.
Is this separation what puts humans into an achievement mindset? The itch and scratch to do, do more, then do less, repeating viciously, insatiably. To perform some work that proves our utility, or more specifically proves that the 'I' is a valuable entity on its own (as if that was something that needed to be proved out). Also, there are other parts of the 'me' story that reinforce our self-value, which again, has an appetite for proving itself worthy, at least of our attention: we wear nice clothes, commute to work, buy nice things, carefully choose and groom social circles..
Now, achievement is quite a fascinating thing in these times. We once had the convenience of looking at our creations as future-proof. As we enhanced our ability to look out into the world and predict, we also saw its limits.
Is 'Agile' nihilistic? Its openness to changing requirements, respecting the limits of our ability to see past the here and now, is a perfect for the software world, in a world where the certainty of Moore's law's means your code cannot be future proofed, it will have to be rewritten.
Our environment is not static, thus our plans must be fluid if we are to achieve anything in a fluid setting.
Small changes have been around for some time, by nature. We see evidence of evolution everywhere. It is more than a way of life, I would argue it is the way of life.