Centralization is a surefire way to fail at pandemic response. You will necessarily be pressuring the wrong intervention measures on people who don't want them when they could stand to intervene in a better way for their own region and serve as a datapoint for the rest of the world to learn from.

You can't sacrifice the superior computational power of decentralized peoples acting in their best interest and substitute it with some truly wishful thinking that there will exist some superior knowledge that just needs centralized power in order to control a pandemic.