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POS it was just an example that no matter how clearer its looks once two or three people can control something like exchanges then it will lead to manipulation. With POS I think the highest stakers control it more than the others. What if two or three people have the highest number of the coins and they decide to withdraw them wouldn't affect the other smaller stakers and in this sense isn't coin central between them.
Major example is Lido and Coinbase controlling almost 40% of ethereum nodes. Can these two manipulate the ethereum node to there favour? Then its slightly similar to CZ controlling Binance
what you learn is user of full nodes are decentralised. but they mainly follow what their favoured services deem as the chain to follow because if their favoured services are following something else they are ignoring the users transactions. so users follow the exchanges decisions on all coins
(exchanges are deemed "economic nodes as oppose to just user nodes)
with coinbase also a custodian of users stake. those users again wont wont to go against their favoured service because saying no to a coinbase decided change is destroying the coins out of users stake to pay miners of the winning chain
so again users follow their favoured service.
this makes places like coinbase a double threat to control. becasie they have coin, code and user fanbase control even if the change is bad. their fans will follow or fear losing their stake
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ethereum when PoS only had a market price trhat was 2x above value because as PoW value was high . but now in PoS the underlying value has droped 15x.. to a new gap of 30x but the price has not corrected yet. so expect ethereum price to drop soon.
right now ethereum is not trading based on its own merit of its own userbase of utility of token demand. it is if you look at the markets.. is blindly following bitcoin prices. meaning ethereum is being held up not by ethereum activity but of market arbitrage holding it up artificially
bitcoin is at great value to buy. ethereum is at bubble inflated premium and not good time to buy