>>81689918
Nevertheless, schizoid personalities are very much real, and individuals with these specific types of abnormal issues that cause dysfunction and distress can be grouped together. There's neurological studies of differences in brain functioning and mass related to schizophrenia spectrum disorders, as well as genetic correlations. So it's not just psychology.

>>81689946
It most likely won't progress. The personality disorders are generally stable and seem to construe some kind of alternate development compared to schizophrenia. Though it's somewhat common for schizoids to have transient (short-term, temporary) psychoses and psychotic symptoms at times. They just never tip over the edge into what would be called schizophrenia.