There surely is a tendency to centralization with PoS. But so is in PoW. In a PoS system, users will use pooling to avoid staking themselfes. In a PoW system,

There surely is a tendency to centralization with PoS. But so is in PoW. In a PoS system, users will use pooling to avoid staking themselfes. In a PoW system, much fewer actors will mine in the first place. And those who do will either be very big or use pooling too. Afaik, just a handful of Bitcoin mining pools hold over 50% of all Bitcoin mining power.