I think, It’s named positive symptoms, because it’s easy to diagnose an SZ patient if they got hallucinations, and delusions. It’s a positive result of the diagnose.
(like if you’re having a blood test for a disease and have a positive result)
It’s harder to diagnose an SZ patient because of the negative symptoms, they look like a lot of other things like depression or just feeling down in general.
Here on the forum, i think there is just as many suffering from negative symptoms as positive.
I have more problems with the negative symptoms, than the positive.