Centralization is a single point of failure for a digital currency. It is not about security only in terms of miners securing the network from attacks, but the control of the network, the trustlessness, and its permissionless nature. These features are the fundamental difference between centralized tokens and decentralized cryptocurrencies.
Permissionless systems deliver censorship-resistant characteristics. Centralized systems are vulnerable to interference by third parties and governments. We want to remove interference that gives power to (let's say) a dev to censor some transactions in the network, generate black lists of not wanted users, or rejection codes similar to the banking institutions and payment processors.
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