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