You're not really addressing the core question here, it was never really about the profitability a depressed person can bring, it was about whether hiring based on a signal of an optimistic personality is unnecessarily exclusionary.

Values-based hiring isn't a magic bullet, it can lead to problems such as having a monoculture. And as I alluded to before, it's possible for hiring too rigidly against a value to unintentionally become a proxy for exclusionary bias.