[whywhywhywhy]

The difference is PoW can still be distributed beyond what exists today if someone decides to get involved and take power away from the consensus.

With PoS the consensus chooses if they want to give up power and you can only gain decentralization if they choose to give it up.

[yazaddaruvala]

POS only works with an active economy i.e. validation requires something to validate e.g. consumers using ETH to buy goods and services. This implies the general population has access to large amounts of liquidity of the currency.

A new institutional investor just needs to start hoarding that easily accessible liquidity and the biggest players in the space will need to give up their share or risk the price of the currency dropping to zero because it’s too hard to transact in it and therefore it’s no longer profitable to tie up 32 ETH and run validators.