Remember socionics is based on people--people are not based on socionics. It is just a theory, a system which shows how human behavior manifests itself through different "functions". this is the reason it's a pseudoscience. Nothing concrete about it, period. If the depth of humanity can be ascribed to such a simple system, i'd think we were all kind of shallow.
Of course I'm still not sure what "type" I am, and I'm still not quite sure I want to invest the time to find out.