Was it Agile that made this possible, or perhaps the organizational abilities of the companies that made this possible? In other words, if the same organizations used a different methodology do you think the results would be completely different?
I am a firm believer that one, "does not get chicken salad out of chicken shit." Thus, well ran and well organized companies would produce similar quality of products regardless of methodology, and in the same vein, poorly ran and disorganized companies will produce garbage regardless of the methodology.
Unfortunately, that story is incredibly boring and goes against the tech blog hivemind.