Even if schizophrenia or other types of psychosis should be an illness (at least the sickness is not independent of the outerworld, see interconnectedness), couldn’t it be not seen as a possiblity for symbiosis with the supposed „illness“ as it is seen in mitochondria who were once bacteria and made a symbiosis with other cells, maybe in the first place they were seen as intruders or evil, but according to the dao <-> yin <-> yan principle can also be seen as good for something and serve a purpose. Maybe also look at the fantasy movie „Phenomenon“ with John Travolta, were a braintumor gave the main character super intelligent mind powers, or especially for greater organisms like states or even bigger world organisms, where „Aliens“/Foreigners/Immigrants can enrichen the culture/society/intelligence of people!