HUMAN NATURE

1.  Humans have evolved to push the envelope:  This is the basis of competition; though competition has a hierarchical component.

2.  Humans are social

3.  Hierarchy is a type of social organization

4.  Competition is one way to organize society

5.  Competition tends to result in a hierarchy

6.  Humans will not choose to permanently discomfort themselves

7.  Humans will not give up what they have unless they must

8.   Ray Dalio argues, capitalism has broken that promise. The relentless pursuit of profit over people has created a structural flaw that threatens to bring the whole system down. [The Guardian, 2-10-20]

It's not the system, per se, it could be better; it's the people in the system, i.e. everybody, that make the system work the way it does.  The system is like the roads in a city, it's the drivers, the people, who choose to, or perhaps can't help but, drive like they do.  People in big powerful cars drive fast and intimidate other drivers because they can, and their nature rewards them for doing so.

So, perhaps it is the system, but it is a system created by human nature.  It is a system created by people to benefit those people at the expense of others.

Why should the people who benefit from a system want to change that system so that it no longer benefits them?

"Power concedes nothing without a struggle."

“All systems should evolve. We all need to evolve. We need to be reformed constantly,” says Dalio.
 
Again the problem of thinking that individuals "evolve".  Rather, species evolve in response to their environments, over a long time, from the standpoint of a human life span.  Ray will definitely not evolve; probably not even his grandchildren, and thus the system will not evolve much because there are many -- billions -- who benefit from the system as it is, or believe that they do; and they will oppose any system change.