Complex Structures Are Conservative
Complex structures do not often appear spontaneously, and are often built iteratively on top of pre-existing structures. Significant changes to these structures is not easily possible. This is because order that is well-established and foundational can not easily be seen. In order for significant changes to occur, a complete revolution may be needed, where the old foundations are torn up and a new structure is built. However, by going through a revolution and making significant changes, you risk triggering unintended consequences.
Examples of conservative structures:
This is seen in large organizations, where it is difficult to make changes or to innovate, as smaller groups are more agile.
The older people get, the harder it is for them to change since they have built many years of established habits. This is why younger people are more malleable. However, the trade-off is that they do not have the same resources as complex organizations or adults do. A person whose values and habits no longer serve them must reinvent themselves.
This can even be seen in software development, where significant changes to large and old code bases is difficult.
In mathematics and physics, everything is built on previous laws, theorems, and axioms. This is why significant revolutions are rare, and would require a foundational change in order for a significant change in the structure to required.
When something evolves, it must build on what nature has already produced. New features may be added, or old features may change, but most things remain the same. Each new feature or change depends on the existance of pre-existing structure, which itself is also dependent on pre-existing structure. It cannot spontanously appear out of nowhere.
References
12 Rules for Life by Jordan Peterson