Also....

The DSM lists schizoaffective disorder under "Schizophrenia and Other Psychotic Disorders," but a strong body of opinion suggests that even though bipolar and schizophrenia are distinct disorders, they form part of a spectrum with overlapping features. Schizoaffective disorder occupies the middle ground between bipolar and schizophrenia, characterized by mania and depression as well as psychosis (delusions, incoherent speech, hallucinations) or other features of schizophrenia.

Perhaps you and the others with your same opinion are actually describing schizoaffective disorder...