There is no perfect system and that same thing with absolutism. Absolute decentralized is not effective nor absolute centralized system. Therefore a combination of both system should do in order to get an effective and efficient system.
This is just a middle ground fallacy. "If both systems have flaws, then the truth is in the middle". Real world does not always work like that.
If you were to combine a centralized system with decentralized, in our case make a blockchain network, but with some central authority, you will just get the worst of both worlds and none of the benefits. It will be slow and inefficient like blockchain, and people will have to put their trust in a central authority.
Satoshi invented Bitcoin to solve the problem of trusted authorities. If you are inviting them back, you're bringing back all the problems that they cause. There is no centralization-decentralization scale here, it's a very binary thing - you either have to trust someone, or the system is trustless.