Model-T is User Experience Defined
Peter Boersma lays out Model T: Big IA is UX. I completely agree with this assessment and view. The field of Information Architecture is very muddled in the eyes of clients and managers as those pitching the services mean different things. Personally I think Richard Saul Wurman's incredible book on information design labeled "Information Architecture" caused a whole lot of the problem. The little IA was evident in the Wurman book and there are many concepts that were delivered to the IA profession from that book, but it was largely about information design.
Getting back to Peter Boersma's wonderful piece, the Model-T hits the correlated professions and roles dead on. This is essentially how things are organized. There are some of us that go deep in more than one area and others that are shallow in most, but also tend to provide great value.