De-centralized power is nice when we aren't under threat.

Climate Change won't be solved by de-centralization of power, and if our alien neighbours decide its time to inhabit earth and get rid of the indigenous population I have a strong feeling that mom and pop who have their own 3D printers so they can make guns and robots in their house won't be able to stand up against existential threats.

For now, de-centralization is nice because it makes each individual worth more. But in the event that we need to work as one and we are all de-centralized, we're going to be obliterated. Take look at the city states of Europe before the Romans conquered them, and then imagine what would have happened if the Roman Legion suddenly invaded a historical European Union.