since that has the longest track record in failure

Failure in achieving what?

A natural disaster would be handled by regional or national disaster response agencies.

How would there be a national disaster response agency without central planning? Who would fund it? Who would run it?

Since after the industrial revolution, the high productivity of cities has been subsidizing the wealth of the suburbs and rural areas to the significant detriment of overall productivity.

Are cities actually more productive, or is their higher productivity subsidised by rural areas?

you will find that the wealth and productive density per person will balance according to the inherit environmental factors to a much larger degree.

Perhaps, but is that what you want? The resource-poor societies of Central Asia lie between theresource-rich China and Europe. Would a theoretical Eurasian government not want to subsidise people living in these regions, so that they can service the trade routes between China and Europe?

a lack of central control and planning does not prevent collaboration and coordination from occuring between entities.

Who mediates disputes, and who enforces their decisions?