But we don't have that level of knowledge yet when it comes to schizophrenia. The closest I can get to such an absolute is "all schizophrenia cases are similar

But we don't have that level of knowledge yet when it comes to schizophrenia. The closest I can get to such an absolute is "all schizophrenia cases are similar in that they manifest as sensory inputs uncorrelated to the outside world", but that isn't really a useful classification -- that description is based on symptoms, not on causes.