You wouldnt need full BP or Schizophrenia to justify this -- if partial traits to partial degrees confer advantage, then the full constellation of them may be dysfunctional in an individual but worth preserving for net benefits. Evolution does not operate at the level of individuals, so most in practice, are often dysfunctional in many respects.
As for schizophrenia, see it is an exageration of rule-seeking and pattern-seeking behaviour, an over-imparting of consciousness and intention to the world, a (disregulated) sense of significance. But each of these are vital for survival and procreation in less extreme degrees.
As for BP, hypomania seems plainly adaptive in some cases (eg., esp. having sex a lot, working a lot, ...); and "hypo-depression" likewise (eg., low opporunitites for winter work, retreating, conserving, less risk takign, etc.).
It also seems adaptive that we would swing between these, so we can better explore the mood-space of motivation.
As for schizophrenia, see it is an exageration of rule-seeking and pattern-seeking behaviour, an over-imparting of consciousness and intention to the world, a (disregulated) sense of significance. But each of these are vital for survival and procreation in less extreme degrees.
As for BP, hypomania seems plainly adaptive in some cases (eg., esp. having sex a lot, working a lot, ...); and "hypo-depression" likewise (eg., low opporunitites for winter work, retreating, conserving, less risk takign, etc.).
It also seems adaptive that we would swing between these, so we can better explore the mood-space of motivation.
You just extremize that and you get disfunction