There are 2-3 options I could see as being possible.

One is less likely, that either you have it or don't and all cases are as extreme as any other.

Second is some people have it or don't, and the people who have it can have varying symptom levels.

Third is that it's a spectrum everyone is on. Technically most people "have it", but have to to such a minor degree that it is classified as not having it. But restructuring how we classify it would reveal a continuum that applies to most of the population.

How binary vs spectral do you think schizophrenia is?

What would a sub-classified schizophrenic person be like?