It has nothing to do with being "more socially relevant"! Bigger groups don't generally bother to review books from smaller groups (or dead groups) unless they have a good reason to do so. That goes for "socially relevant" groups and completely irrelevant groups alike. I don't think that's a good thing. In fact, I think that the AFA book should be taken seriously, both in terms of its merits and its flaws. I'm just pointing out why left groups haven't done so.