[bumby]

>Certain traits, like conscientiousness and agreeableness, are generally seen as universally positive

It's my understanding that agreeableness isn't universally positive. Think about if you had an airline quality engineer who was too agreeable; they may not push back on a deficient product and defer to those who want to push it through just to get along. I've also heard that the most successful people don't necessarily score high on agreeableness.