I would disagree. The data suggest that anxiety is a response to threat. There is no evidence of a pathological or pathogenic excess of neurotranmitters in anxiety. The idea that illness is a protection is an old Freudian one ("neurotic defence") which has been invalidated repeatedly over the years. Why not consider anxiety to be the normal response to threat? Avoidance is also a response to threat. Lets normalise the suffering of those we try to help, not complicate and pathologise.