Stability. In 'decentralized' systems, if any entity does something dumb, the impact is localized and consequently negligible. By contrast in centralized systems, one misstep by the central power can trigger catastrophic consequences. Another benefit of decentralized systems is that sometimes those dumb things end up being brilliant, and so we end up with a much richer system with a better idea of what works and what doesn't work, what's stable and what isn't, and so on.

Decentralized systems also help local entities develop and grow into their own. Necessity is the mother of invention and centralized systems largely remove the necessity of local expertise which cripples efforts to advance it. This is the 17th declared major outbreak of ebola in the DRC. One would think that by the time you've had a few major ebola outbreaks, let alone 16, you'd be building up a rich body of expertise, knowledge, and competence, but that does not really seem to be the case.