AnonyMint seems abosolutely convinced that PoS cannot work.
If he says so, it has to be true. PoS should shut down all operations within 24 hours and go home.
My understanding is that PoS has attack vectors that are not present in PoW, giving the attacker a cheaper way to totally control/destroy the network. On the other hand, even credit cards "work", in a way. Nothing is perfect, even PoW.