There are two problems here: The first is that a lot of ethereum talk is just that; hot air with little substance. The second is that PoS has significantly wor

There are two problems here: The first is that a lot of ethereum talk is just that; hot air with little substance. The second is that PoS has significantly worse security properties than PoW. The core reason is that "changing your mind" (rolling back the blockchain) is free with PoS, except for possible loss of value of the cryptocurrency, whereas it's extremely expensive with PoW. There are all sorts of band-aids you can slap on like ignoring block reorgs of a certain depth, but then you lose properties like network partition tolerance.