So with PoS, we recreate a system where a few rich pool have decision over the network. Can someone enlighten me on how this is different from the current fiat system?
Current system is no different, as the hash power is related to how many computers you can afford to buy. This doesn't fix the problem but it does fix the environmental impact.
PoS also does not come with the property of innovation and disruption. In a PoW (especially ASIC-based) system you will find new ways to outperform your peers and disrupt old players.
PoW incentivices cheap energy in developing countries more than anything before. It is the fix for environmental problems.