Is Schizophrenia a “Psychotic Disorder”?

Some researchers say that the “mental” illness called “schizophrenia” or “schizoaffective” might not really be a “psychotic disorder” since even after treating the psychosis, the person is generally left with severe impairments in function.

What IS a “Psychotic Disorder", Anyway?

Following up on the question Is Schizophrenia a “Psychotic Disorder”, if neurodevelopmental, genetic and medical problems resulting in psychosis are not "psychotic disorders"... then what really IS a "psychotic disorder?"