Systems should be designed for principled centralization, with a jewel bearing.
All systems have some kind of emergent centralization.
A system that is designed to be fully decentralized will then have layers outside the system that become centralized.
Instead of hoping that doesn't happen, design it so that it emerges in a balanced, contained, beneficial way.
A jewel bearing is a pivot point that the whole system can rotate around, but is small and structurally aligned with the goals of the system.
By having that one pivot point of beneficial centralization inside the system, you can make sure it's governed in a way that is aligned with the long-term incentives of the overall system.