One can endlessly debate over the question which cars actually changed the world. For example, why the Ro80? It had a revolutionary type of engine.... which up until now has failed to break any ground. How did that change the world? And how is that different from the BAT series, where revolutionary streamlining techniques where applied, which weren't followed up either? The Alfasud had extremely poorly executed coachwork, as we all know, but it DID set new standards for front wheel drive road holding. And as far as the Trabant is concerned, it was big in it's day and location. It didn't change OUR part of the world, but it definitely did in it's homeland.
In other words: you lay way too much emphasis on a title, of which most of us know that it should of course be taken with a grain of salt.
And yes, the book doesn't go very deep. This is true. But what can one expect from a book in this price class.