I would wager that more jobs accelerate psychological and physiological issues than, say, volunteering or unemployment with active community engagement do. At the very least, the psychological benefits of unemployment are objectively an incidental side-effect of its actual purpose, which is labor for a profitable enterprise. That is to say that employment is still "functional" if it generates that labor even while destroying someone's psychological health. If that health is paramount, the structure of employment probably needs to change in order to privilege health over productivity, even to productivity's detriment. Otherwise, the vast majority of people would be better off with some other institution.