I think that bitcoin needs POS instead of POW so that we can empower bitcoin holders instead of feeding the greedy miners and pools who are always in conflict to control bitcoin. If we have the access to POS then even holding bitcoins at our bitcoin wallet we are being empowered to do some staking. That way the bitcoin holders are contributing to the bitcoin network instead of the greedy miners.
POS does ZERO to stop greed
you just have people trying to gain control another way
once you buy enough staking power, you have it , it is done
pow attack must be maintained