That goes for anything, every system ever made by humans. Even the first forms of democracy, including direct democracy, falls under this umbrella. After all in the theory-world, where everything is ideal, humans do behave good so communism (but any form of good government is possible, even anarchy or a good autocracy).
In the real world, though, humans behave like humans so you get corruption and weird power play. So even if you got a nice working system where every human support society, it will inevitably fail under corruption after the first generations of those who put in place such a system die; which is exactly what happens throughout history each time, even in Athens.
Tldr: theoretical perfect system cannot exist in practice since we are flawed creatures
That goes for anything, every system ever made by humans. Even the first forms of democracy, including direct democracy, falls under this umbrella. After all in the theory-world, where everything is ideal, humans do behave good so communism (but any form of good government is possible, even anarchy or a good autocracy).
In the real world, though, humans behave like humans so you get corruption and weird power play. So even if you got a nice working system where every human support society, it will inevitably fail under corruption after the first generations of those who put in place such a system die; which is exactly what happens throughout history each time, even in Athens.
Tldr: theoretical perfect system cannot exist in practice since we are flawed creatures