Poorly executed centralization easily turns into communism, which fails spectacularly on anything but tribal scales.
Decentralization sure has its problems, but tends to beat the alternatives. Of course, where you end up in each system and how you benefit/suffer there may influence whether you agree.
I certainly wasn't advising against decentralizing. Only warning against thinking of it as an easily implemented no-brainer, a la "just decentralize everything, and everything is going to start working smoothly, like magic". Naive libertarianism hasn't proved to be more effective than naive Communism, and most people including myself believe it isn't.
Decentralization sure has its problems, but tends to beat the alternatives. Of course, where you end up in each system and how you benefit/suffer there may influence whether you agree.