Check https://www.reddit.com/r/ethereum/comments/492fse/serenity_poc2_ethereum_blog/d0okwaw and https://www.reddit.com/r/ethereum/comments/492fse/serenity_poc2_ethereum_blog/d0oik7j, please. Are those centralization concerns legit? I suspect that any real criticism will be shadowbanned on sites controlled by Ethereum marketing team, so I'm asking here.