And they were correct until Satoshi invented a solution the Byzantine General's problem with proof-of-work.
Non sequitur for me. Crypto-currencies are many things but they won't annul the theories and efforts of Marxists (even with proper anonymity, quite the contrary in fact), as they strive for equality (as a result! "From each according to their ability, to each according to their needs") and total(itarian?) transparency.Autonomous actors in an economy is not the same equal actors. There is no force to keep them equal.
The reason anonymity is important is because it enables that autonomy to stand up against those vested interests that want to capture the money creation process and use it to aggregate capital. Without that power, smaller capital grows faster than larger capital.
Sorry i can't explain this in depth right now. Either that summary makes sense, or it needs to wait for a future time when i can expound.