One thing that PoW has for it is this idea of "something outside the system". In essence the miners are somewhat economically forced to sell their mined coins i

One thing that PoW has for it is this idea of "something outside the system". In essence the miners are somewhat economically forced to sell their mined coins in order to rent the energy/mining-rigs. Hence helping with re-distributing the wealth across the network - presumably in a very fair fashion since it's the free market (exchanges). In PoS this re-sell doesn't happen. Once you are chosen to mine a block (because of your stake) you mine it and that's it. You're not incentivized to redistribute your coins. You can hoard them because you don't have to rent any resources from outside the system. I hate PoW energy consumption as well and I think that its purpose - literally competing to consume more energy - is quite horrible. But so far I don't think PoS offers the same properties as PoW: a fairer system to redistribute coins.