As it happens, blackcat, the new DSM-5 does group disorders into degree of severity--or, rather, degree of support necessary to function.
A few thoughts: In general, I view the key element to disorder-vs-diversity as being pathology, by which I mean, the extent to which the profile interferes with major life functions (including the subjective happiness and well-being of the individual concerned). If there is something about the profile which impairs that person's capacity to live a full and satisfying life without significant support, then I think we are entering the realm of pathology.
Of course, we all have to make accommodations to other people; no man is an island, after all. Perhaps support becomes significant when the environment has to make modifications to suit an individual that are disproportionate compared to those made for the other members of the community.
