“Plato tried it with his Republic and the Perfect Society.”
Plato’s Republic was never put into practice anywhere. He may have wrote the work in 380 B.C., that did not make it an introduced practice of any government anywhere; none of the Greek governments or the Romans.
That does not excuse the governments that were in practice at the time - tyrants most often; it’s just that they did not attempt to copy Plato’s Republic.
You could argue that Marx and Engle never put their theory into practice either.
Uncle Joe did and we see how that worked.
My point is, communism has been tried, both in theory and in practice and it has never worked unless you fudge the numbers, or as another posted said, ignore the laws of physics.