Well, this is the first Philip K. Dick book I have read(listened). I know he is kind of one of our heroes.
Remember he had temporal lobe epilepsy. And remember many other prolific artists did/do also.
I had a patient with temporal lobe epilepsy many years ago and it was fascinating to try to take care of him and his problems. He wasn't an artist but very interesting.
The book was good with many philosophic and theological concepts interwoven.