Earlier quoted context omitted.
I think the GP means that central planning was hard to pull off without modern communication tech like phones and internet. So, the western style of federated semi-autonomous regions proliferated, since it didn't depend on strong central control. However, in the age of instant global communications, it may be that effective central planning is "better," or at least possible. And now, the individualistic model may not…
Centralized planning works if leaders are "right" about things, and have a certain measure of benevolence. Many East Asian economies (Singapore, South Korea, China, Taiwan, etc.) had dictators that did the "right" thing and brought about huge economic growth. However, centralized planning has one fatal evolutionary flaw -- any errors from the top are amplified. The biggest example of this was China closing its ports…
But such a thing would probably require forming a new society from scratch. As you mentioned, the USA was the "Great Experiment" that many old-world royalists scoffed at. Maybe the time will come for another?