I agree with what you say, except only the aphorism.

"There can be perfect individuals but not perfect systems".

I would say the opposite, there can be perfect systems, but never perfect individuals. Ideas such as systems may be perfect, but at the moment they try to put them into practice they will find a total disaster, because people are never perfect enough to fulfill the role that needs to be fulfilled in almost any type of society, that is why in systems where people have less power, such as monarchies, there is a greater harmony between theory and practice.