The person whose character is essentially schizoid is subject to widespread misunderstanding, based on the common misconception that schizoid dynamics are always suggestive of grave primitivity. Because the incontrovertibly psychotic diagnosis of schizophrenia fits people at the disturbed end of the schizoid continuum, and because the behavior of schizoid people can be unconventional, eccentric, or even bizarre, nonschizoid others tend to pathologize those with schizoid dynamics—whether or not they are competent and autonomous, with significant areas of ego strength. In fact, schizoid people run the gamut from the hospitalized catatonic patient to the creative genius. (link to original; scroll to Chapter 9, Schizoid Personalities)
This is one of the best essays on psychology I have seen in a long time. Highly recommended. I bet the whole book is good, but all I have read so far is this chapter. ABN