People who are psychotic do bizarre things even when stabalised on mrdication. I know someone who is highly qualified and holds down a job, although she changes it about every 6 months? but her home life and personal life is chaotic and she exhibits bizarre unpredictable behavour. To her she is fine.
Yes, there are wide variations in all illnesses. My late partner was definitely on the autistic spectrum, but Concorde flew courtesy of equipment he'd designed, and our latest, and only recently launched warship was the last project he worked on prior to his death. However, a friend's 25 year old grandson who is also autistic, lives in self contained accommodation -by choice- in the grounds of his parents' home and still wets the bed. Sheila never qualified at anything. Nor did she hold down a job.