I think a major theme of Wasteland was the concept of lost knowledge. In Wasteland, this concept is represented by the description of the Guardians (http://wasteland.wikia.com/wiki/Guardians
), or by an incident/joke about the rail nomads (I don't remember it, though).
I think that rather shortly after the holocaust, knowledge started to get lost, and resulted in communities that, at least in this regards, are not different from people who lived in the middle ages and found artifacts of a star traveling alien race. They know that these items may be of great power, but they do neither know what powers they have, nor how they can be invoked, and much less how they can even be produced.
What it means is that people may find certain artifacts, but they don't know its function, they don't know what actions need to be performed in order to invoke its power; nevertheless, they may feel that such items might have great value.
So it would not be surprising if various cults begin to raise about technology. For us, a toaster repair man seems to be pretty rediculous. In a world were even the knowledge what a toaster is is lost, a toaster repair man may have great power, and bring hope to the peope. (And I think it only remains absurd if toaster repair doesn't extent to other fields of knowledge.)
I think that lost knowledge has an impact on the whole world, while it may differ from community to community what technologies are available (including knowledge about the functions of political institutions as well), the extent of knowledge what these technologies can, how they function, and how they are produced.