Postmodernism suggests a radical change in culture.
In this, it is consistent with Postman, McLuhan, and other media ecology scholars, except that the latter place media at the center of that change. The changes identified, and often celebrated by pomo is much more than a bit of flexibility and a bit less universality, otherwise pomo would not loom so large in cultural theory. I see no problem with some flexibility, etc. I do see a problem with social and cultural breakdown, however. A little understanding of pomo can be a dangerous thing, if it doesn't include the historical significance of the end of modernity.