I totally get your point, but keep in mind that decentralization doesn't mean that everyone's vote counts the same. It just means that no one person or company owns the blockchain. If you become a whale in America, you can have as much influence as a whale in China.
Communism does intend everyone to have the same wealth, and it always fails. Blockchain decentralization never promised communism; it is more like the wild west!
Steem is a piece of the code (chain) of the blockchaine of the Steemit. Whale has more chains (systems) than I do. In theory, this means that who owns whales owns a Steemit. And to control several dozen whales is easier than all the others.